{"product_id":"trigonostigma-heteromorpha-rasbora-harlequin-uk-4141","title":"Trigonostigma Heteromorpha (Harlequin Rasboras) - UK","description":"\u003cp\u003e\u003cem\u003eTrigonostigma heteromorpha\u003c\/em\u003e, better known as the Harlequin Rasbora, has earned its place as one of the most dependable and attractive community fish in the hobby. Its glowing copper-orange body and bold black wedge make it instantly recognisable, and in a well-kept group the effect is even better. If you are looking for a peaceful, active shoaling species that suits a planted tropical aquarium, this classic cyprinid is still one of the best choices available. Many keepers searching for a solid \u003cstrong\u003erasbora heteromorpha care guide\u003c\/strong\u003e want a fish that is hardy, social, and suitable for mixed community tanks, and this species delivers on all three.\u003c\/p\u003e\u003cp\u003eAdult \u003cstrong\u003eharlequin rasboras size\u003c\/strong\u003e is usually around 4.5-5 cm, with a lifespan of up to 5 years when water quality is stable and diet is varied. They come from slow-moving blackwater streams and forest pools in Thailand, Malaysia, and Sumatra, so they appreciate warm, slightly acidic to neutral water, subdued lighting, and plenty of plant cover. Questions such as \u003cstrong\u003eharlequin rasboras tank size\u003c\/strong\u003e, \u003cstrong\u003eharlequin rasboras temperature\u003c\/strong\u003e, \u003cstrong\u003eharlequin rasboras water parameters\u003c\/strong\u003e, and \u003cstrong\u003eare harlequin rasboras schooling fish\u003c\/strong\u003e are common for good reason: these fish look and behave best in a proper group with the right layout.\u003c\/p\u003e\u003cp\u003eSee our detailed photos showing the sharp body pattern, healthy finnage, and even colour across the group. Whether you want \u003cstrong\u003e10 harlequin rasboras\u003c\/strong\u003e for a new aquascape or are comparing them with \u003cstrong\u003etrigonostigma espei\u003c\/strong\u003e or \u003cstrong\u003etrigonostigma hengeli\u003c\/strong\u003e, this species is a superb all-rounder for the modern tropical aquarium rasbora UK keeper. For aquarists wanting a peaceful midwater fish with elegant movement and reliable community behaviour, \u003cem\u003eTrigonostigma heteromorpha\u003c\/em\u003e is an easy recommendation.\u003c\/p\u003e\u003cdiv class=\"info-box\"\u003e\n\u003ch4\u003e🔹 Quick Facts\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003eTrigonostigma heteromorpha\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCare Level:\u003c\/strong\u003e Easy to moderate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMin Tank Size:\u003c\/strong\u003e 60 litres (13+ gallons)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature:\u003c\/strong\u003e 23-28°C (73-82°F)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH Range:\u003c\/strong\u003e 6.0-7.5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLifespan:\u003c\/strong\u003e Up to 5 years\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperament:\u003c\/strong\u003e Peaceful\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiet:\u003c\/strong\u003e Omnivore\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"species-profile\"\u003e\n\u003ch3\u003eClassification\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrder:\u003c\/strong\u003e Cypriniformes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFamily:\u003c\/strong\u003e Cyprinidae\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenus:\u003c\/strong\u003e Trigonostigma\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Harlequin Rasbora is one of the best known members of the cyprinid family in aquaria and remains the benchmark species for small peaceful rasboras. It became popular in the early aquarium trade because it combines strong colour, calm temperament, and straightforward care. Related aquarium species include \u003cem\u003eTrigonostigma espei\u003c\/em\u003e, \u003cem\u003eTrigonostigma hengeli\u003c\/em\u003e, and other small Southeast Asian schooling fish.\u003c\/p\u003e\n\u003c\/div\u003e\u003ch2 id=\"origin\"\u003eWhere Do Trigonostigma Heteromorpha Come From? Natural Habitat Explained\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eharlequin rasboras origin\u003c\/strong\u003e lies in Southeast Asia, especially Thailand, Peninsular Malaysia, Singapore, and Sumatra. In nature, the \u003cstrong\u003eharlequin rasboras habitat\u003c\/strong\u003e is usually made up of slow forest streams, peat-influenced waters, and shaded pools with leaf litter, roots, and submerged vegetation. This is why the \u003cstrong\u003eharlequin rasbora natural habitat\u003c\/strong\u003e is often described as soft, warm, tannin-stained water with gentle current rather than bright, open river channels.\u003c\/p\u003e\u003cp\u003eIf you have ever wondered \u003cstrong\u003ewhere are harlequin rasboras native to\u003c\/strong\u003e, the answer is lowland tropical waters where overhanging plants and tree cover reduce light. The \u003cstrong\u003eharlequin rasbora in the wild\u003c\/strong\u003e spends much of its time in the middle water layer, moving in loose groups and picking at tiny invertebrates, insect larvae, and organic matter. That makes \u003cstrong\u003ewhere do harlequin rasboras swim\u003c\/strong\u003e and \u003cstrong\u003ewhere do harlequin rasboras swim in the tank\u003c\/strong\u003e easy to answer: mostly the middle region, especially where there is open swimming space bordered by plants.\u003c\/p\u003e\u003cp\u003eThe \u003cstrong\u003eharlequin rasbora native range\u003c\/strong\u003e helps explain why they do so well in planted aquariums. They are adapted to warm tropical conditions, but unlike some delicate blackwater species they are fairly forgiving once established. The \u003cstrong\u003erasbora heteromorpha habitat\u003c\/strong\u003e also explains their preference for darker substrate, driftwood, and calm surroundings. Aquarists trying to recreate a \u003cstrong\u003etrigonostigma heteromorpha biotope\u003c\/strong\u003e often use leaf litter tones, fine plants, and subdued lighting to mimic these forest waters.\u003c\/p\u003e\u003cp\u003eFor buyers asking \u003cstrong\u003ewhat are rasboras fish\u003c\/strong\u003e, they are small cyprinids known for shoaling behaviour, peaceful temperaments, and suitability for mixed tropical communities. The term \u003cstrong\u003erasbora heteromorpha origine\u003c\/strong\u003e is sometimes searched by hobbyists comparing wild background and care needs, and in this case the wild setting strongly supports a planted, warm, stable aquarium. Conservation pressure varies by locality, but the species remains widely available in the hobby and is well established in captive breeding.\u003c\/p\u003e\u003cdiv class=\"tip-box\"\u003e\n\u003ch4\u003e💡 Expert Tip\u003c\/h4\u003e\n\u003cp\u003eMimicking the natural habitat of Harlequin Rasboras improves colour, confidence, and schooling behaviour. Dark substrate, floating plant shade, and gentle flow often make a shy group settle within days rather than weeks.\u003c\/p\u003e\n\u003c\/div\u003e\u003ch2 id=\"tank-setup\"\u003eHow to Set Up the Perfect Tank for Trigonostigma Heteromorpha\u003c\/h2\u003e\u003cp\u003eGetting the setup right is the difference between a nervous, washed-out shoal and a lively display group. Most questions about \u003cstrong\u003eharlequin rasboras tank setup\u003c\/strong\u003e, \u003cstrong\u003eharlequin rasboras aquarium setup\u003c\/strong\u003e, and \u003cstrong\u003eharlequin rasbora tank requirements\u003c\/strong\u003e come down to three things: enough swimming room, stable warm water, and cover from plants or wood.\u003c\/p\u003e\u003ch3\u003eTank Size Requirements\u003c\/h3\u003e\u003cp\u003eThe accepted \u003cstrong\u003eharlequin rasboras minimum tank size\u003c\/strong\u003e is 60 litres, which is also the practical answer to \u003cstrong\u003erasbora heteromorpha tank size\u003c\/strong\u003e for a starter group. A 60-litre tank can house 8-10 fish, but a longer aquarium of 75-90 litres is better if you want stronger schooling and more tank mates. When people ask \u003cstrong\u003ehow many harlequin rasboras in a tank\u003c\/strong\u003e, the safest answer is never fewer than 8, with 10 or 12 often giving the best display. That is why groups such as \u003cstrong\u003e12 harlequin rasboras\u003c\/strong\u003e are popular in planted community layouts.\u003c\/p\u003e\u003cp\u003eBecause they are active midwater fish, length matters more than height. A long footprint gives them room to turn together and maintain a natural formation. If you are planning a mixed community, increase space rather than trying to squeeze extra stock into the \u003cstrong\u003eharlequin rasboras tank size\u003c\/strong\u003e minimum.\u003c\/p\u003e\u003ch3\u003eWater Parameters\u003c\/h3\u003e\u003cp\u003eReliable \u003cstrong\u003eharlequin rasboras water parameters\u003c\/strong\u003e are straightforward: temperature 23-28°C, pH 6.0-7.5, and hardness 2-15 dGH. The best \u003cstrong\u003eharlequin rasbora ideal temperature\u003c\/strong\u003e for everyday care is around 24-26°C, which also answers \u003cstrong\u003ewhat temperature do harlequin rasboras like\u003c\/strong\u003e. If you are searching \u003cstrong\u003eharlequin rasboras water temperature\u003c\/strong\u003e, \u003cstrong\u003eharlequin rasbora water parameters\u003c\/strong\u003e, \u003cstrong\u003eharlequin rasbora tank temperature\u003c\/strong\u003e, \u003cstrong\u003eharlequin rasbora temperature range\u003c\/strong\u003e, \u003cstrong\u003eharlequin rasbora temperature\u003c\/strong\u003e, \u003cstrong\u003erasbora heteromorpha temperature\u003c\/strong\u003e, or \u003cstrong\u003erasbora heteromorpha water temperature\u003c\/strong\u003e, these fish are happiest in stable tropical warmth rather than fluctuating room temperature.\u003c\/p\u003e\u003cp\u003eThe ideal answer to \u003cstrong\u003eharlequin rasboras water hardness\u003c\/strong\u003e is soft to moderately hard water. They tolerate more than many blackwater fish, but softer water usually improves colour and breeding success. In UK homes, one of the most common questions is \u003cstrong\u003edo harlequin rasboras need a heater\u003c\/strong\u003e; in most cases yes, because room temperatures drift too much for long-term tropical stability. For anyone searching \u003cstrong\u003ekeilfleckbrbling temperatur\u003c\/strong\u003e or \u003cstrong\u003eharlequin rasboras temp\u003c\/strong\u003e, aim for consistency, not just a number on paper.\u003c\/p\u003e\u003cdiv class=\"spec-grid\"\u003e\n\u003cdiv class=\"spec-card\"\u003e\n\u003cdiv class=\"spec-value\"\u003e23-28°C\u003c\/div\u003e\n\u003cdiv class=\"spec-label\"\u003eTemperature\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spec-card\"\u003e\n\u003cdiv class=\"spec-value\"\u003e6.0-7.5\u003c\/div\u003e\n\u003cdiv class=\"spec-label\"\u003epH\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spec-card\"\u003e\n\u003cdiv class=\"spec-value\"\u003e2-15 dGH\u003c\/div\u003e\n\u003cdiv class=\"spec-label\"\u003eHardness\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spec-card\"\u003e\n\u003cdiv class=\"spec-value\"\u003e60L+\u003c\/div\u003e\n\u003cdiv class=\"spec-label\"\u003eMinimum Tank\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003ch3\u003eFiltration\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHarlequin rasboras filtration needs\u003c\/strong\u003e are moderate. They appreciate clean, oxygenated water, but they do not enjoy being blasted around by excessive current. A gentle internal filter or a well-baffled hang-on-back unit works well. Fine mechanical and biological filtration are more important than strong flow. Keep ammonia and nitrite at zero, and nitrates low through weekly maintenance.\u003c\/p\u003e\u003ch3\u003eSubstrate, Plants \u0026amp; Decor\u003c\/h3\u003e\u003cp\u003eFine dark sand or smooth fine gravel suits them best. Darker colours reduce stress and make the orange body glow more strongly. For aquarists asking \u003cstrong\u003ewhat plants do harlequin rasboras like\u003c\/strong\u003e, choose species that create edges and overhead cover without blocking all open water. Good options include Cryptocoryne, Java fern, Anubias, Limnophila, and floating plants. A classic setup for \u003cstrong\u003eharlequin rasboras in planted tank\u003c\/strong\u003e uses rooted Cryptocoryne and driftwood to echo the natural habitat.\u003c\/p\u003e\u003cp\u003eYou can also compare this species with related forms such as \u003ca href=\"\/products\/trigonostigma-heteromorpha\"\u003eGold Harlequin Rasboras\u003c\/a\u003e, \u003ca href=\"\/products\/trigonostigma-heteromorpha\"\u003eBlack Harlequin Rasboras\u003c\/a\u003e, or the broader \u003ca href=\"\/products\/rasbora-heteromorpha\"\u003eRasbora heteromorpha community fish range\u003c\/a\u003e when planning a themed shoal aquarium. If you are browsing for more \u003ca href=\"\/products\/tropical-fish-uk\"\u003etropical fish for a planted community\u003c\/a\u003e, similar Southeast Asian species often work well in the same décor style.\u003c\/p\u003e\u003ch3\u003eLighting\u003c\/h3\u003e\u003cp\u003eModerate lighting is ideal. Very bright light without floating cover can make them skittish. Use 6-8 hours daily for low-tech planted tanks and provide shaded patches. Their best colours usually appear over dark substrate with broken light from floating plants.\u003c\/p\u003e\u003cdiv class=\"info-box\"\u003e\n\u003ch4\u003eQuick Setup Checklist\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eChoose a tank of at least 60 litres, longer if possible\u003c\/li\u003e\n\u003cli\u003eKeep a group of 8 or more for natural schooling\u003c\/li\u003e\n\u003cli\u003eSet temperature to 24-26°C for stable tropical conditions\u003c\/li\u003e\n\u003cli\u003eUse soft to moderately hard water with pH 6.0-7.5\u003c\/li\u003e\n\u003cli\u003eAdd plants, driftwood, and shaded areas\u003c\/li\u003e\n\u003cli\u003eMaintain gentle filtration and regular weekly water changes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"tip-box\"\u003e\n\u003ch4\u003e💡 Pro Tip\u003c\/h4\u003e\n\u003cp\u003eAlways cycle the aquarium for 4-6 weeks before adding Harlequin Rasboras. They are hardy once established, but newly set up tanks with unstable bacteria are a common cause of early losses in community fish.\u003c\/p\u003e\n\u003c\/div\u003e\u003ch2 id=\"feeding\"\u003eWhat Do Trigonostigma Heteromorpha Eat? Complete Feeding Guide\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre harlequin rasboras omnivores\u003c\/strong\u003e? Yes. A balanced \u003cstrong\u003eharlequin rasboras diet\u003c\/strong\u003e includes quality micro pellets, crushed flakes, frozen foods, and occasional live foods. In the wild they pick at tiny insect prey and organic matter, so a varied \u003cstrong\u003erasbora heteromorpha diet\u003c\/strong\u003e is better than relying on one dry food alone.\u003c\/p\u003e\u003cp\u003eIf you are asking \u003cstrong\u003ewhat do harlequin rasboras eat\u003c\/strong\u003e, \u003cstrong\u003ewhat rasbora heteromorpha eat\u003c\/strong\u003e, \u003cstrong\u003ewhat to feed harlequin rasbora\u003c\/strong\u003e, or \u003cstrong\u003ewhat to feed harlequin rasboras\u003c\/strong\u003e, think small particles they can take from the water column. Their mouths are small, so oversized pellets are often ignored. A practical \u003cstrong\u003eharlequin rasboras feeding guide\u003c\/strong\u003e is to feed tiny portions twice daily, only what the group clears in 30-60 seconds.\u003c\/p\u003e\u003ch3\u003eStaple Foods\u003c\/h3\u003e\u003cp\u003eUse a good tropical micro pellet or finely crushed flake as the staple. This covers daily energy needs and keeps maintenance simple.\u003c\/p\u003e\u003ch3\u003eSupplemental Foods\u003c\/h3\u003e\u003cp\u003eOffer frozen daphnia, cyclops, baby brine shrimp, and finely chopped bloodworm 2-4 times weekly. These foods improve condition and are especially useful before \u003cstrong\u003eharlequin rasboras breeding\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eTreats \u0026amp; Conditioning Foods\u003c\/h3\u003e\u003cp\u003eLive baby brine shrimp and microworms are excellent for bringing fish into peak condition. If someone asks \u003cstrong\u003ewhat day rasbora heteromorpha eat\u003c\/strong\u003e, the real answer is every day, but with variety across the week rather than a single repetitive meal.\u003c\/p\u003e\u003ch3\u003eFeeding Frequency \u0026amp; Portion Control\u003c\/h3\u003e\u003cp\u003eA simple routine works best. Overfeeding is far more common than underfeeding in home aquariums. If you notice bloating or leftover food collecting in plants, reduce the amount immediately.\u003c\/p\u003e\u003ctable class=\"comparison-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eTime\u003c\/th\u003e\n\u003cth\u003eFood\u003c\/th\u003e\n\u003cth\u003eAmount\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMorning\u003c\/td\u003e\n\u003ctd\u003eMicro pellet or crushed flake\u003c\/td\u003e\n\u003ctd\u003eSmall pinch, eaten within 1 minute\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEvening\u003c\/td\u003e\n\u003ctd\u003eFrozen daphnia, cyclops, or baby brine shrimp\u003c\/td\u003e\n\u003ctd\u003eVery small portion, no leftovers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eQuestions like \u003cstrong\u003ecan harlequin rasboras eat betta food\u003c\/strong\u003e come up often. In an emergency they may take small betta pellets, but betta foods are not ideal as a long-term staple because pellet size and nutrient balance are aimed at a different fish. Another common search is \u003cstrong\u003ewhy is my harlequin rasboras not eating\u003c\/strong\u003e. The usual causes are stress after transport, water that is too cold, bullying from faster feeders, or food that is simply too large.\u003c\/p\u003e\u003cp\u003eOn invertebrates, \u003cstrong\u003edo harlequin rasboras eat shrimp\u003c\/strong\u003e, \u003cstrong\u003eharlequin rasboras eat shrimp\u003c\/strong\u003e, \u003cstrong\u003ewill harlequin rasboras eat shrimp\u003c\/strong\u003e, \u003cstrong\u003ewill harlequin rasboras eat baby shrimp\u003c\/strong\u003e, \u003cstrong\u003ewill harlequin rasboras eat cherry shrimp\u003c\/strong\u003e, and \u003cstrong\u003ewill.harlequin rasboras eat amano shrimp\u003c\/strong\u003e all have slightly different answers. Adults usually ignore adult Amano shrimp and most larger adult cherry shrimp in a planted tank, but tiny shrimplets may be eaten. As for snails, \u003cstrong\u003eharlequin rasbora eat snails\u003c\/strong\u003e is generally no; they may peck at very soft eggs or weakened snails, but they are not a snail-control species.\u003c\/p\u003e\u003cdiv class=\"food-recommendation\"\u003e\n\u003ca href=\"\/products\/tropical-fish-uk\"\u003eFine tropical micro foods and frozen treats\u003c\/a\u003e work well for Harlequin Rasboras because their small mouths are designed for tiny midwater prey rather than large pellets.\u003c\/div\u003e\u003cdiv class=\"warning-box\"\u003e\n\u003ch4\u003e⚠️ Feeding Warning\u003c\/h4\u003e\n\u003cp\u003eOverfeeding causes ammonia spikes, cloudy water, and stressed fish. Small schooling species do best with tiny frequent meals, not large dumps of food that sink into the substrate.\u003c\/p\u003e\n\u003c\/div\u003e\u003ch2 id=\"appearance\"\u003eTrigonostigma Heteromorpha Appearance: Colors, Patterns \u0026amp; Varieties\u003c\/h2\u003e\u003cp\u003eThe classic Harlequin Rasbora has a laterally compressed body, a warm copper to orange-pink base colour, and a large black triangular wedge on the rear half of the body. This wedge is the feature that gives the fish its common name. Adult size is usually around 5 cm, making them ideal for medium community tanks without disappearing visually.\u003c\/p\u003e\u003cp\u003eHealthy specimens show clear red to orange tones in the fins, a neat forked tail, and a sharply defined body mark. In strong groups over dark décor, the contrast becomes much richer. Hobbyists sometimes search \u003cstrong\u003erasbora heteromorpha black\u003c\/strong\u003e or \u003cstrong\u003etrigonostigma heteromorpha blue\u003c\/strong\u003e when comparing colour forms online. The standard species is not truly blue, but lighting and camera settings can make the body sheen look cooler. Black Harlequin variants deepen the dark wedge and body contrast, while gold forms soften the overall look.\u003c\/p\u003e\u003cp\u003eFor sexing, \u003cstrong\u003eharlequin rasboras male vs female\u003c\/strong\u003e is usually judged by body shape and wedge line. Females are often fuller-bodied, especially when carrying eggs, while males are slimmer and may show a slightly sharper wedge shape. During spawning condition, females become noticeably rounder. That is useful if you are monitoring \u003cstrong\u003eif rasbora heteromorpha breeding\u003c\/strong\u003e or trying to identify whether \u003cstrong\u003eis rasbora heteromorpha breeding\u003c\/strong\u003e behaviour is starting.\u003c\/p\u003e\u003cp\u003eOur photos show the clean wedge pattern and strong copper body colour that aquarists expect from well-settled fish. Good diet, stable warm water, and dark substrate all improve appearance. This is one reason \u003cstrong\u003erasbora heteromorpha care\u003c\/strong\u003e remains so popular: they reward correct care with visible colour and confident movement.\u003c\/p\u003e\u003ch2 id=\"compatibility\"\u003eWhat Fish Can Live With Trigonostigma Heteromorpha? Compatibility Guide\u003c\/h2\u003e\u003cp\u003eIf you are asking \u003cstrong\u003ewhat fish can live with rasboras\u003c\/strong\u003e, Harlequin Rasboras are among the easiest answers in the hobby. They are peaceful, active, and non-territorial, which makes them excellent \u003cstrong\u003eharlequin rasboras tank mates\u003c\/strong\u003e for calm community fish of similar size and temperament. In most setups, \u003cstrong\u003eare rasbora fish aggressive\u003c\/strong\u003e, \u003cstrong\u003eare rasboras aggressive\u003c\/strong\u003e, \u003cstrong\u003eare harlequin rasboras aggressive\u003c\/strong\u003e, and \u003cstrong\u003eare rasbora heteromorpha aggressive\u003c\/strong\u003e can all be answered with no. However, \u003cstrong\u003ecan harlequin rasboras be aggressive\u003c\/strong\u003e under stress? Occasionally they may chase lightly within the group, especially if kept in too small a shoal, but this is social pecking rather than real aggression.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre harlequin rasboras schooling fish\u003c\/strong\u003e and \u003cstrong\u003eare rasboras schooling fish\u003c\/strong\u003e? Yes, though in home aquariums they often shoal loosely unless startled. If you are wondering \u003cstrong\u003ewhy are my harlequin rasboras not schooling\u003c\/strong\u003e, the usual reasons are too small a group, too much open space with no visual boundaries, or a tank so calm and safe that they feel no need to hold a tight formation. Add more fish, plants, and side cover, and the group usually tightens up.\u003c\/p\u003e\u003ch3\u003eIdeal Tank Mates\u003c\/h3\u003e\u003cp\u003eExcellent companions include other peaceful Southeast Asian fish and small community species. Good examples are \u003ca href=\"\/products\/tropical-fish-uk\"\u003eScissortail Rasboras\u003c\/a\u003e in larger tanks, \u003ca href=\"\/products\/tropical-fish-uk\"\u003eRed-Tailed Rasboras\u003c\/a\u003e for a rasbora-themed setup, and bottom dwellers such as \u003cstrong\u003epangio kuhlii\u003c\/strong\u003e if you want a calm substrate species. Dwarf gouramis such as \u003cstrong\u003etrichogaster lalius\u003c\/strong\u003e can work in a suitable tank if the gourami is not overly territorial. Many aquarists also compare them with \u003ca href=\"\/products\/trigonostigma-heteromorpha\"\u003eGold Harlequin Rasboras\u003c\/a\u003e and \u003ca href=\"\/products\/trigonostigma-heteromorpha\"\u003eBlack Harlequin Rasboras\u003c\/a\u003e when building a display around colour variations.\u003c\/p\u003e\u003cp\u003eQuestions like \u003cstrong\u003ecan harlequin rasboras live with neon tetras\u003c\/strong\u003e are common, and yes, in a warm peaceful community they usually can. \u003cstrong\u003eCan harlequin rasboras live with guppies\u003c\/strong\u003e is also possible, though guppies prefer harder, more alkaline water than the rasboras do, so compatibility depends on choosing a middle ground. Searches such as \u003cstrong\u003ekeilfleckbrbling und guppys\u003c\/strong\u003e reflect the same concern.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan harlequin rasboras live with bettas\u003c\/strong\u003e, \u003cstrong\u003ecan rasbora heteromorpha live with bettas\u003c\/strong\u003e, and \u003cstrong\u003eharlequin rasboras compatible with betta\u003c\/strong\u003e all require caution. It can work in a well-planted tank with a calm betta and enough space, but long-finned or territorial bettas may either bully the rasboras or be stressed by their activity. This is why searches like \u003cstrong\u003ewhat rasbora heteromorpha with betta\u003c\/strong\u003e, \u003cstrong\u003ewhat day rasbora heteromorpha with betta\u003c\/strong\u003e, \u003cstrong\u003ewhat time rasbora heteromorpha with betta\u003c\/strong\u003e, \u003cstrong\u003ewhen rasbora heteromorpha with betta\u003c\/strong\u003e, \u003cstrong\u003ewhy rasbora heteromorpha with betta\u003c\/strong\u003e, and \u003cstrong\u003ewhich rasbora heteromorpha with betta\u003c\/strong\u003e need a case-by-case answer rather than a blanket yes.\u003c\/p\u003e\u003ch3\u003eCompatibility with Invertebrates\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eCan harlequin rasboras live with shrimp\u003c\/strong\u003e? Usually yes with adult Amano shrimp and larger Neocaridina in heavily planted tanks. Searches like \u003cstrong\u003ekeilfleckbrbling und garnelen\u003c\/strong\u003e reflect this. The key is plant cover and realistic expectations: adults are often fine, but shrimplets may be preyed on. Snails are generally safe.\u003c\/p\u003e\u003ch3\u003eSpecies to Avoid\u003c\/h3\u003e\u003cp\u003eAvoid large cichlids, fin-nippers, and predatory fish. Searches such as \u003cstrong\u003erasbora heteromorpha cichlid\u003c\/strong\u003e usually indicate a mismatch. Angelfish are another frequent question: \u003cstrong\u003ecan harlequin rasboras live with angelfish\u003c\/strong\u003e only in larger, carefully managed aquariums, and even then there is risk once angelfish mature.\u003c\/p\u003e\u003ctable class=\"comparison-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecies\u003c\/th\u003e\n\u003cth\u003eCompatible?\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/tropical-fish-uk\"\u003eScissortail Rasboras\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e✅ Yes\u003c\/td\u003e\n\u003ctd\u003ePeaceful, active, but better in larger tanks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/tropical-fish-uk\"\u003eRed-Tailed Rasboras\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e✅ Yes\u003c\/td\u003e\n\u003ctd\u003eGood for a rasbora-themed community\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBetta splendens\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e⚠️ Caution\u003c\/td\u003e\n\u003ctd\u003eDepends on betta temperament and tank layout\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAngelfish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e⚠️ Caution\u003c\/td\u003e\n\u003ctd\u003ePossible in larger tanks, but adults may prey on small fish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLarge cichlids\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e❌ Avoid\u003c\/td\u003e\n\u003ctd\u003eToo aggressive and predatory for Harlequins\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eFor many keepers, this is the \u003cstrong\u003ebest rasbora for community tank\u003c\/strong\u003e use because of its calm nature, visible schooling, and broad compatibility. If you want a peaceful shoal with other small fish, \u003cstrong\u003eharlequin rasboras with other fish\u003c\/strong\u003e is usually a very safe route.\u003c\/p\u003e\u003cdiv class=\"tip-box\"\u003e\n\u003ch4\u003e💡 Compatibility Tip\u003c\/h4\u003e\n\u003cp\u003eAlways quarantine new arrivals for 2-4 weeks before adding them to a community aquarium. This protects established rasboras from parasites and gives new fish time to recover from transport stress.\u003c\/p\u003e\n\u003c\/div\u003e\u003ch2 id=\"breeding\"\u003eHow to Breed Trigonostigma Heteromorpha: Complete Breeding Guide\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHarlequin rasboras breeding\u003c\/strong\u003e is very achievable, but it is more specialised than breeding livebearers. This species is best described as moderate rather than easy because egg survival depends on soft, slightly acidic water and the right spawning surfaces. If you are searching \u003cstrong\u003erasbora heteromorpha breeding\u003c\/strong\u003e, \u003cstrong\u003ecan rasbora heteromorpha breeding\u003c\/strong\u003e, \u003cstrong\u003edoes rasbora heteromorpha breeding\u003c\/strong\u003e, or \u003cstrong\u003ehow rasbora heteromorpha breeding\u003c\/strong\u003e, the key detail is that they lay adhesive eggs on the underside of broad leaves rather than scattering them openly.\u003c\/p\u003e\u003ch3\u003eBreeding Setup\u003c\/h3\u003e\u003cp\u003eUse a separate 20-40 litre breeding tank with soft water, pH around 6.0-6.8, and temperature 26-28°C. Add broad-leaved plants such as Cryptocoryne or spawning mops angled to imitate leaf undersides. Dim lighting helps. Condition adults with frozen and live foods for 1-2 weeks before pairing or group spawning.\u003c\/p\u003e\u003ch3\u003eSpawning Behaviour\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHarlequin rasbora breeding behavior\u003c\/strong\u003e is distinctive. The female often selects the underside of a leaf and turns upside down beneath it. The male joins her, and eggs are deposited in small batches. People asking \u003cstrong\u003eare rasbora heteromorpha breeding\u003c\/strong\u003e or \u003cstrong\u003edid rasbora heteromorpha breeding\u003c\/strong\u003e often miss the eggs because they are tucked under leaves. A large female may lay 80-100 eggs, with exceptional fish producing more. So if you are asking \u003cstrong\u003ehow many rasbora heteromorpha breeding\u003c\/strong\u003e, that is the realistic range for a good spawn.\u003c\/p\u003e\u003ch3\u003eEgg Care \u0026amp; Hatching\u003c\/h3\u003e\u003cp\u003eRemove the adults after spawning because they may eat eggs. Depending on temperature, eggs usually hatch in about 24 hours, and fry become free-swimming a few days later. That answers \u003cstrong\u003ehow long rasbora heteromorpha breeding\u003c\/strong\u003e in practical terms: spawning may take a few hours, hatching around a day, and free-swimming fry several days after that.\u003c\/p\u003e\u003ch3\u003eFry Care \u0026amp; Growth\u003c\/h3\u003e\u003cp\u003eStart with infusoria or liquid fry food, then move to microworms and newly hatched brine shrimp as the fry grow. If you are asking \u003cstrong\u003ehow small rasbora heteromorpha breeding\u003c\/strong\u003e, the fry are tiny and need correspondingly small first foods. Growth is steady in warm clean water with daily small water changes.\u003c\/p\u003e\u003ch3\u003eCommon Breeding Challenges\u003c\/h3\u003e\u003cp\u003eHard water, bright light, and poor conditioning are the main reasons spawns fail. Searches like \u003cstrong\u003ehave rasbora heteromorpha breeding\u003c\/strong\u003e, \u003cstrong\u003ehow often rasbora heteromorpha breeding\u003c\/strong\u003e, \u003cstrong\u003ehow much rasbora heteromorpha breeding\u003c\/strong\u003e, \u003cstrong\u003ehow big rasbora heteromorpha breeding\u003c\/strong\u003e, and \u003cstrong\u003ehow far rasbora heteromorpha breeding\u003c\/strong\u003e are often really asking how to improve success. The answer is softer water, broad leaves, and very clean conditions.\u003c\/p\u003e\u003cdiv class=\"tip-box\"\u003e\n\u003ch4\u003eAdvanced Breeding Tip\u003c\/h4\u003e\n\u003cp\u003eUse mature Cryptocoryne leaves and condition breeders on live baby brine shrimp for 7-10 days before spawning. In my experience, this combination gives better egg placement, stronger fertility, and more consistent hatch rates than bare breeding tanks with only mops.\u003c\/p\u003e\n\u003c\/div\u003e\u003ch2 id=\"comparison\"\u003eTrigonostigma Heteromorpha vs Similar Species: Which Should You Choose?\u003c\/h2\u003e\u003cp\u003eHarlequin Rasboras are often compared with lambchop rasboras and glowlight rasboras because all three share a wedge-like pattern and peaceful community nature. Comparison matters because size, colour tone, and confidence in mixed tanks can differ quite a bit.\u003c\/p\u003e\u003ctable class=\"comparison-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eTrigonostigma heteromorpha\u003c\/th\u003e\n\u003cth\u003eTrigonostigma espei\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Size\u003c\/td\u003e\n\u003ctd\u003e5 cm\u003c\/td\u003e\n\u003ctd\u003e3-3.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCare Level\u003c\/td\u003e\n\u003ctd\u003eEasy to moderate\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature\u003c\/td\u003e\n\u003ctd\u003e23-28°C\u003c\/td\u003e\n\u003ctd\u003e24-28°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003e£16.13\u003c\/td\u003e\n\u003ctd\u003eVaries\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest For\u003c\/td\u003e\n\u003ctd\u003eClassic community shoal\u003c\/td\u003e\n\u003ctd\u003eSmaller planted nano-style communities\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ctable class=\"comparison-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eTrigonostigma heteromorpha\u003c\/th\u003e\n\u003cth\u003eTrigonostigma hengeli\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Look\u003c\/td\u003e\n\u003ctd\u003eDeeper body, bold wedge\u003c\/td\u003e\n\u003ctd\u003eSlimmer body, lighter mark with orange line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVisibility\u003c\/td\u003e\n\u003ctd\u003eVery easy to see in mixed tanks\u003c\/td\u003e\n\u003ctd\u003eMore delicate visual effect\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSchooling\u003c\/td\u003e\n\u003ctd\u003eStrong in groups of 10+\u003c\/td\u003e\n\u003ctd\u003eExcellent in planted groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest For\u003c\/td\u003e\n\u003ctd\u003eBeginner-friendly community tanks\u003c\/td\u003e\n\u003ctd\u003eRefined aquascapes and smaller fish pairings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailability\u003c\/td\u003e\n\u003ctd\u003eVery common\u003c\/td\u003e\n\u003ctd\u003eModerately common\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eIf you want the most recognisable and forgiving option, \u003cem\u003eTrigonostigma heteromorpha\u003c\/em\u003e is usually the best starting point. It is larger and bolder than \u003cstrong\u003etrigonostigma espei\u003c\/strong\u003e and \u003cstrong\u003etrigonostigma hengeli\u003c\/strong\u003e, making it easier to keep with a wider range of community species. Hobbyists also compare forms such as \u003cstrong\u003etrigonostigma truncata\u003c\/strong\u003e, \u003cstrong\u003eespes keilfleckbrbling\u003c\/strong\u003e, and \u003cstrong\u003ehengels keilfleckbrbling\u003c\/strong\u003e when looking for subtle differences in body shape and wedge pattern.\u003c\/p\u003e\u003cp\u003eIf you want a stronger wedge and a more classic look, choose Harlequins. If you want a smaller, more delicate fish for a tightly planted aquascape, Espei or Hengeli may suit better. For most aquarists asking \u003cstrong\u003ewhich rasbora heteromorpha\u003c\/strong\u003e or \u003cstrong\u003ewhich rasbora heteromorpha is best\u003c\/strong\u003e, the answer is the standard Harlequin when reliability and community flexibility matter most.\u003c\/p\u003e\u003ch2 id=\"health\"\u003eCommon Health Problems in Trigonostigma Heteromorpha \u0026amp; How to Prevent Them\u003c\/h2\u003e\u003cp\u003eGood \u003cstrong\u003eharlequin rasboras health\u003c\/strong\u003e starts with stable temperature, clean water, and low stress. Healthy fish show clear eyes, full finnage, strong colour, and active midwater swimming. A settled shoal feeds eagerly and keeps a loose but coordinated formation.\u003c\/p\u003e\u003ch3\u003eCommon Diseases \u0026amp; Symptoms\u003c\/h3\u003e\u003cp\u003eThe most common \u003cstrong\u003eharlequin rasboras diseases\u003c\/strong\u003e are the same ones seen in many tropical community fish: ich, fin damage from poor water quality, bacterial infections after stress, and wasting from internal parasites. Searches for \u003cstrong\u003eharlequin rasbora diseases\u003c\/strong\u003e, \u003cstrong\u003eharlequin rasbora illness\u003c\/strong\u003e, and \u003cstrong\u003eharlequin rasbora ich\u003c\/strong\u003e usually point to white spots, clamped fins, flashing, or loss of appetite. Ich often appears after sudden temperature drops or after adding unquarantined fish.\u003c\/p\u003e\u003ch3\u003eTreatment Options\u003c\/h3\u003e\u003cp\u003eStart with water testing before medicating. Correct ammonia, nitrite, or temperature problems first. Move affected fish to quarantine if possible, especially in mixed tanks. Use proven fish-safe medications and follow dosage carefully. If shrimp are present, avoid copper-based treatments in the main display.\u003c\/p\u003e\u003ch3\u003ePrevention Tips\u003c\/h3\u003e\u003cp\u003eWeekly water changes of 25-30%, varied feeding, and avoiding overcrowding prevent most issues. Stable tropical warmth is especially important because these fish do not like repeated cold swings. Many early problems in \u003cstrong\u003eaquarium rasbora UK\u003c\/strong\u003e setups come from underheated tanks in winter or from adding too few fish, which increases stress.\u003c\/p\u003e\u003cdiv class=\"warning-box\"\u003e\n\u003ch4\u003e⚠️ Health Warning\u003c\/h4\u003e\n\u003cp\u003eNever use copper-based medications in a display tank that contains shrimp or other sensitive invertebrates. Copper can be lethal even at low concentrations.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"info-box\"\u003e\n\u003ch4\u003eQuarantine Protocol\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eUse a separate bare-bottom tank for 2-4 weeks\u003c\/li\u003e\n\u003cli\u003eMatch temperature and pH to the display tank\u003c\/li\u003e\n\u003cli\u003eObserve feeding response, breathing, and skin condition daily\u003c\/li\u003e\n\u003cli\u003eTest water regularly and keep ammonia and nitrite at zero\u003c\/li\u003e\n\u003cli\u003eOnly move fish once they are active, feeding, and symptom-free\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cp\u003eFor keepers researching \u003cstrong\u003ewhich rasbora heteromorpha breeding\u003c\/strong\u003e lines are strongest, the healthiest stock usually comes from fish that have been well conditioned, properly quarantined, and not rushed through transport and resale. Prevention is always easier than cure with small schooling fish.\u003c\/p\u003e\u003ch2 id=\"behavior\"\u003eUnderstanding Trigonostigma Heteromorpha Behavior in the Aquarium\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHarlequin rasboras behaviour\u003c\/strong\u003e is one of their biggest selling points. They are active but not frantic, visible but not pushy, and social without becoming troublesome. In the right group size they spend most of the day cruising the middle of the tank, turning together through open water and then retreating into plants when startled.\u003c\/p\u003e\u003cp\u003eThey are not true tight schoolers every second of the day. Instead, they shoal loosely when relaxed and tighten formation when alarmed or when lights first come on. This is why people often ask \u003cstrong\u003ewhy are my harlequin rasboras not schooling\u003c\/strong\u003e. It is usually normal behaviour rather than a problem. A larger group, darker décor, and more side planting often produce a more dramatic schooling effect.\u003c\/p\u003e\u003cp\u003eBecause they are calm and forgiving, many hobbyists consider them \u003cstrong\u003eharlequin rasboras for beginners\u003c\/strong\u003e. They also fit the description of \u003cstrong\u003ebrilliant rasbora care\u003c\/strong\u003e for aquarists who want visible natural behaviour without dealing with aggression. In a planted aquarium they show their best confidence, especially when kept in a proper shoal and not mixed with boisterous tank mates.\u003c\/p\u003e\u003ch2 id=\"why-buy\"\u003eWhy Buy from Tropical Fish Co?\u003c\/h2\u003e\u003cp\u003eWhen you \u003cstrong\u003ebuy harlequin rasboras UK\u003c\/strong\u003e, quality matters more than simply chasing the lowest listing. Small schooling fish travel best when they are well conditioned before dispatch, packed in sensible group sizes, and sent only once they are feeding confidently. For this product, the focus is on even-sized groups, clean finnage, and strong wedge pattern so your shoal settles quickly and looks cohesive in the aquarium.\u003c\/p\u003e\u003cp\u003eOur Harlequin Rasboras are held, observed, and checked for feeding response before sale. That matters with shoaling cyprinids because weak or underconditioned fish often fade after transport. If you are comparing \u003cstrong\u003eharlequin rasboras for sale UK\u003c\/strong\u003e, \u003cstrong\u003eharlequin rasboras online UK\u003c\/strong\u003e, \u003cstrong\u003eharlequin rasbora for sale\u003c\/strong\u003e, \u003cstrong\u003ebuy rasbora UK\u003c\/strong\u003e, or \u003cstrong\u003erasbora for sale UK\u003c\/strong\u003e, it is worth choosing stock that has already adjusted to captive foods and stable tropical parameters.\u003c\/p\u003e\u003cp\u003eFor delivery, fish are packed in insulated boxes with professional bagging methods, and heat packs are used in winter conditions where needed. Tracked delivery helps reduce time in transit, and careful packing is especially important for active midwater fish like rasboras. If you are searching \u003cstrong\u003eharlequin rasboras delivery UK\u003c\/strong\u003e, \u003cstrong\u003eorder harlequin rasboras UK\u003c\/strong\u003e, or \u003cstrong\u003ewhere to buy harlequin rasboras UK\u003c\/strong\u003e, this is exactly the kind of handling you should expect.\u003c\/p\u003e\u003cp\u003eBuyers also compare \u003cstrong\u003eharlequin rasboras price UK\u003c\/strong\u003e and even search \u003cstrong\u003echeap harlequin rasboras UK\u003c\/strong\u003e, but the real value is in healthy fish that settle, feed, and school properly. If you need a reliable \u003cstrong\u003eharlequin rasboras shop UK\u003c\/strong\u003e option for a planted community tank, these fish are an excellent choice. Order your Harlequin Rasboras today with confidence and build a shoal that will add movement, colour, and calm community behaviour from day one.\u003c\/p\u003e\u003cdiv class=\"care-highlight\"\u003e\n\u003ch4\u003eWhy Choose Tropical Fish Co for Harlequin Rasboras\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eGroups selected for even size and clean wedge pattern so the shoal looks consistent in display tanks\u003c\/li\u003e\n\u003cli\u003eObserved for feeding response before dispatch, helping new arrivals settle faster onto prepared foods\u003c\/li\u003e\n\u003cli\u003ePacked for UK transit with insulated materials and seasonal heat protection where required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003ch2 id=\"related-products\"\u003eYou Might Also Like\u003c\/h2\u003e\u003cp\u003eBuild a stronger community around your Harlequins with related species and compatible rasbora options. Compare the classic look of \u003ca href=\"\/products\/trigonostigma-heteromorpha\"\u003eHarlequin Rasboras\u003c\/a\u003e with \u003ca href=\"\/products\/trigonostigma-heteromorpha\"\u003eGold Harlequin Rasboras\u003c\/a\u003e for a lighter colour tone or \u003ca href=\"\/products\/trigonostigma-heteromorpha\"\u003eBlack Harlequin Rasboras\u003c\/a\u003e for deeper contrast. For larger peaceful shoals, \u003ca href=\"\/products\/tropical-fish-uk\"\u003eScissortail Rasboras\u003c\/a\u003e add elegant movement, while \u003ca href=\"\/products\/tropical-fish-uk\"\u003eRed-Tailed Rasboras\u003c\/a\u003e suit Southeast Asian community layouts. If you are still comparing forms, browse the \u003ca href=\"\/products\/rasbora-heteromorpha\"\u003eRasbora heteromorpha collection\u003c\/a\u003e to choose the best fit for your aquascape.\u003c\/p\u003e","brand":"Tropical Fish Co","offers":[{"title":"1,2 - 1,5 cm","offer_id":57379808543055,"sku":"S140","price":1.99,"currency_code":"GBP","in_stock":false},{"title":"1,5 - 1,9 cm","offer_id":57456895951183,"sku":"SR41","price":2.99,"currency_code":"GBP","in_stock":false},{"title":"2,5 - 3 cm","offer_id":57456895983951,"sku":"4141","price":3.99,"currency_code":"GBP","in_stock":true},{"title":"\u003e 3 cm","offer_id":57467467170127,"sku":"4142","price":2.99,"currency_code":"GBP","in_stock":true},{"title":"2 cm","offer_id":57560691016015,"sku":"4140","price":2.99,"currency_code":"GBP","in_stock":false},{"title":"XXL","offer_id":57560691048783,"sku":"4155","price":5.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/1408\/6735\/files\/harlequin-rasboras-trigonostigma-heteromorpha-cyprinid-hero-driftwood-s140.webp?v=1776719091","url":"https:\/\/tropical-fish-co.myshopify.com\/products\/trigonostigma-heteromorpha-rasbora-harlequin-uk-4141","provider":"Tropical Fish Co","version":"1.0","type":"link"}