{"product_id":"cardinal-tetras-neon-uk","title":"Cardinal Tetras (Paracheirodon axelrodi) - UK","description":"\u003cp\u003e\u003cstrong\u003eCardinal Tetras\u003c\/strong\u003e are one of those rare aquarium fish that look almost unreal when the light catches them. The electric blue stripe and full-length red band of \u003cem\u003eParacheirodon axelrodi\u003c\/em\u003e create a glowing effect that makes even a simple aquascape feel alive. Native to the blackwater streams of the upper Orinoco and Rio Negro, these peaceful South American tetras stay small, usually reaching a \u003cstrong\u003ecardinal tetra size\u003c\/strong\u003e of around 3-5 cm, yet they make a huge visual impact when kept in a large school. If you have been researching \u003cstrong\u003ecardinal tetra care\u003c\/strong\u003e, \u003cstrong\u003ecardinal tetra lifespan\u003c\/strong\u003e, \u003cstrong\u003ecardinal tetras minimum tank size\u003c\/strong\u003e, or the ideal \u003cstrong\u003ecardinal tetras temperature\u003c\/strong\u003e, this guide covers the details that matter in real home aquariums. They are not the hardest fish to keep, but stable water quality, soft water, and a proper group size are essential. See our detailed photos showing the intense blue and red contrast in a planted aquarium, where these fish display their best colour and natural schooling behaviour. For fishkeepers who want a classic shoaling species with elegant movement, strong community-tank potential, and true Amazon character, Cardinal Tetras remain one of the best choices in the hobby.\u003c\/p\u003e\n\n\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\u003eParacheirodon axelrodi\u003c\/em\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCare Level:\u003c\/strong\u003e Moderate\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMin Tank Size:\u003c\/strong\u003e 60 litres (about 13 gallons)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTemperature:\u003c\/strong\u003e 23-27°C (73-81°F)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003epH Range:\u003c\/strong\u003e 4.5-7.0\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\n\n\u003cdiv class=\"species-profile\"\u003e\n  \u003ch3\u003eClassification\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOrder:\u003c\/strong\u003e Characiformes\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFamily:\u003c\/strong\u003e Characidae\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGenus:\u003c\/strong\u003e \u003cem\u003eParacheirodon\u003c\/em\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\u003cem\u003eParacheirodon axelrodi\u003c\/em\u003e is one of the best-known members of the South American tetra group and is closely associated with other popular aquarium species such as \u003cem\u003eParacheirodon innesi\u003c\/em\u003e. In the hobby, cardinals are often chosen by aquarists who want a more vivid alternative to the common neon tetra. Their place in the aquarium trade is well established, and they remain a favourite in blackwater biotopes, planted aquariums, and peaceful community displays.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"origin\"\u003eWhere Do Cardinal Tetras Come From? Natural Habitat Explained\u003c\/h2\u003e\n\u003cp\u003eThe natural \u003cstrong\u003ecardinal tetras habitat\u003c\/strong\u003e is the upper Orinoco and Negro river systems in South America. These waters are famous for being soft, acidic, tannin-rich, and shaded by dense rainforest canopy. If you have ever wondered \u003cstrong\u003ewhere do neon tetras live in the wild\u003c\/strong\u003e or explored the broader \u003cstrong\u003eneon tetra habitat\u003c\/strong\u003e, Cardinal Tetras come from a similar style of environment: slow-moving tributaries, flooded forest margins, and leaf-litter zones where light is dim and the water chemistry is gentle.\u003c\/p\u003e\n\u003cp\u003eThis \u003cstrong\u003eneon tetra native habitat\u003c\/strong\u003e style is why cardinals do best in calm, mature aquariums. In the wild, they forage among roots, submerged branches, and fine plants for tiny invertebrates, insect larvae, and micro-crustaceans. So while many hobbyists ask \u003cstrong\u003ewhat do neon tetras eat in the wild\u003c\/strong\u003e, the answer also helps explain the ideal \u003cstrong\u003ecardinal tetras diet\u003c\/strong\u003e: small, protein-rich foods with some plant matter and variety.\u003c\/p\u003e\n\u003cp\u003ePeople often ask \u003cstrong\u003eare neon tetras natural\u003c\/strong\u003e and \u003cstrong\u003ewhere are neon tetras native to\u003c\/strong\u003e. The answer is yes, both neon and cardinal species are naturally occurring South American characins, though cardinals are specifically associated with warmer blackwater conditions. The \u003cstrong\u003eneon tetra origin\u003c\/strong\u003e and \u003cstrong\u003eneon tetra native range\u003c\/strong\u003e are often discussed alongside cardinals because the two species look similar, but cardinals generally prefer slightly warmer and softer water. That difference matters in long-term care.\u003c\/p\u003e\n\u003cp\u003eIn these rainforest waterways, fish gather in a \u003cstrong\u003elarge neon tetra school\u003c\/strong\u003e-style formation for safety, and Cardinal Tetras behave the same way. Their reflective stripe helps keep the group coordinated in low light. Recreating that shaded, root-filled \u003cstrong\u003eneon tetra environment\u003c\/strong\u003e in the aquarium reduces stress and supports stronger colour.\u003c\/p\u003e\n\u003cdiv class=\"tip-box\"\u003e\n  \u003ch4\u003e💡 Expert Tip\u003c\/h4\u003e\n  \u003cp\u003eMimicking the natural blackwater habitat with dim lighting, dark substrate, leaf litter tones, and gentle flow improves colour, reduces skittish behaviour, and helps Cardinal Tetras settle much faster after introduction.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"tank-setup\"\u003eHow Do You Set Up the Perfect Tank for Cardinal Tetras?\u003c\/h2\u003e\n\u003cp\u003eGood \u003cstrong\u003ecardinal tetras tank setup\u003c\/strong\u003e starts with stability. Although these fish are often suggested as \u003cstrong\u003ecardinal tetras for beginners\u003c\/strong\u003e, they are best kept by aquarists who understand cycling, water changes, and the importance of avoiding sudden shifts. The \u003cstrong\u003ecardinal tetras tank size\u003c\/strong\u003e should be at least 60 litres, which is the accepted \u003cstrong\u003ecardinal tetras minimum tank size\u003c\/strong\u003e for a proper group. In practice, a larger aquarium of 75-90 litres gives a much better result because it allows a bigger school and more stable water chemistry.\u003c\/p\u003e\n\u003cp\u003eIf you are comparing this to a \u003cstrong\u003e6 neon tetra tank size\u003c\/strong\u003e or researching \u003cstrong\u003eneon tetra minimum tank size\u003c\/strong\u003e, remember that Cardinal Tetras should be kept in groups of 10 or more. That means the \u003cstrong\u003eneon tetra recommended tank size\u003c\/strong\u003e often discussed online for a tiny shoal is not the ideal benchmark here. For anyone asking \u003cstrong\u003ehow many cardinal tetras in a tank\u003c\/strong\u003e, a 60-litre aquarium suits 10-12 fish, while larger tanks can support a more impressive school with compatible species.\u003c\/p\u003e\n\u003ch3\u003eTank Size Requirements\u003c\/h3\u003e\n\u003cp\u003eThe fish are active midwater swimmers, so horizontal swimming space matters more than height. A long tank with open central space and planting around the edges works better than a tall cube. Strong schooling behaviour becomes much more visible once the group reaches 10+. That is also the answer to \u003cstrong\u003ehow many neon tetras should be kept together\u003c\/strong\u003e: more is better, and the same rule applies to cardinals.\u003c\/p\u003e\n\u003ch3\u003eWater Parameters\u003c\/h3\u003e\n\u003cp\u003eThe ideal \u003cstrong\u003ecardinal tetra temperature\u003c\/strong\u003e is 23-27°C, with 24-26°C being a sweet spot for most home aquariums. If you are searching \u003cstrong\u003ecardinal tetras water temperature\u003c\/strong\u003e, \u003cstrong\u003ecardinal tetras water parameters\u003c\/strong\u003e, or \u003cstrong\u003eparacheirodon axelrodi temperature\u003c\/strong\u003e, aim for warm, stable conditions rather than chasing extremes. Soft water is strongly preferred, with hardness around 1-8 dGH and pH between 4.5 and 7.0. Many aquarists compare this to \u003cstrong\u003eneon tetra temperature\u003c\/strong\u003e, \u003cstrong\u003eneon tetra ideal temperature\u003c\/strong\u003e, \u003cstrong\u003eneon tetra optimal temperature\u003c\/strong\u003e, and even \u003cstrong\u003eparacheirodon innesi temperature\u003c\/strong\u003e. Cardinals generally like it a touch warmer than standard neons.\u003c\/p\u003e\n\u003cp\u003eFor those asking \u003cstrong\u003ewhat temperature neon tetra\u003c\/strong\u003e or \u003cstrong\u003eneon tetra minimum temperature\u003c\/strong\u003e, the answer for cardinals is simple: do not let them sit in cool water for long periods. And yes, \u003cstrong\u003edo neon tetras need a heater\u003c\/strong\u003e? In most UK homes, absolutely. Cardinals do too. A reliable heater is not optional for year-round consistency.\u003c\/p\u003e\n\u003cdiv class=\"spec-grid\"\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  \u003cdiv class=\"spec-card\"\u003e\n\u003cdiv class=\"spec-value\"\u003e23-27°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\"\u003e4.5-7.0\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\"\u003e1-8 dGH\u003c\/div\u003e\n\u003cdiv class=\"spec-label\"\u003eHardness\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eFiltration\u003c\/h3\u003e\n\u003cp\u003eUse a mature filter with gentle to moderate flow. Sponge filters, compact internal filters, or well-baffled external filters all work. Avoid blasting current across the full tank length. Cardinals come from slower water, so they appreciate circulation without being pinned in place.\u003c\/p\u003e\n\u003ch3\u003eSubstrate, Plants \u0026amp; Decor\u003c\/h3\u003e\n\u003cp\u003eA dark sand or fine gravel substrate helps the colours stand out. \u003cstrong\u003eCardinal tetras in planted tank\u003c\/strong\u003e layouts look especially striking, and dense planting also helps nervous fish feel secure. Fine-leaved plants, floating cover, driftwood, and root tangles are ideal. If you enjoy tetra communities, you can also browse \u003ca href=\"\/products\/neon-tetra\"\u003eEnhance Your Aquarium with 6 X\u003c\/a\u003e for comparison, or add contrast with \u003ca href=\"\/products\/glowlight-tetras\"\u003eGlowlight Tetras - Hemigrammus Erythrozonus\u003c\/a\u003e in a larger, carefully planned display of \u003cstrong\u003eneons cardinals and glowlights\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eLighting\u003c\/h3\u003e\n\u003cp\u003eModerate to subdued lighting is best. Bright, exposed tanks often wash out colour and increase stress. Floating plants or tannin-stained water can soften the effect. This is one reason many aquarists prefer a natural blackwater look for \u003cstrong\u003ecardinal tetras aquarium setup\u003c\/strong\u003e projects.\u003c\/p\u003e\n\u003cdiv class=\"info-box\"\u003e\n  \u003ch4\u003eQuick Setup Checklist\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003eCycle the aquarium fully before adding fish\u003c\/li\u003e\n    \u003cli\u003eKeep a group of at least 10 Cardinal Tetras\u003c\/li\u003e\n    \u003cli\u003eMaintain 23-27°C with a reliable heater\u003c\/li\u003e\n    \u003cli\u003eUse soft, clean, stable water\u003c\/li\u003e\n    \u003cli\u003eAdd plants, wood, and shaded areas\u003c\/li\u003e\n    \u003cli\u003eChoose gentle filtration and low stress tank mates\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tip-box\"\u003e\n  \u003ch4\u003e💡 Pro Tip\u003c\/h4\u003e\n  \u003cp\u003eAlways cycle the tank for 4-6 weeks before adding Cardinal Tetras. They are much less forgiving of ammonia and nitrite than hardier beginner fish, especially in newly set up aquariums.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"feeding\"\u003eWhat Do Cardinal Tetras Eat? Complete Feeding Guide\u003c\/h2\u003e\n\u003cp\u003eThe natural \u003cstrong\u003ecardinal tetras diet\u003c\/strong\u003e is omnivorous but leans toward tiny live prey. In the aquarium, the best approach is a varied menu of quality micro pellets, crushed flakes, frozen foods, and occasional live foods. If you are asking \u003cstrong\u003ewhat do cardinal tetras eat\u003c\/strong\u003e, think small, soft, and easy to swallow. Their mouths are tiny, so oversized foods are often ignored.\u003c\/p\u003e\n\u003cp\u003eMany buyers search \u003cstrong\u003ewhat neon tetra eat\u003c\/strong\u003e, \u003cstrong\u003ewhat to feed neon tetras\u003c\/strong\u003e, and \u003cstrong\u003eneon tetra diet\u003c\/strong\u003e because the care is similar. A good staple is a fine tropical micro pellet or crushed flake designed for small community fish. Supplement this with daphnia, cyclops, baby brine shrimp, and finely chopped bloodworm. Yes, \u003cstrong\u003ecan neon tetras eat bloodworms\u003c\/strong\u003e? They can, but only in very small portions because large bloodworms are too rich as a staple.\u003c\/p\u003e\n\u003cp\u003eQuestions like \u003cstrong\u003ewhat time neon tetras eat\u003c\/strong\u003e, \u003cstrong\u003ewhen to feed neon tetras\u003c\/strong\u003e, and even \u003cstrong\u003ewhat day neon tetras eat\u003c\/strong\u003e come up surprisingly often. The practical answer is once or twice daily, at roughly the same times each day. Feed only what the school can finish in 30-60 seconds. A regular \u003cstrong\u003ecardinal tetras feeding guide\u003c\/strong\u003e prevents bloat and keeps water quality high.\u003c\/p\u003e\n\u003cp\u003eA few common myths are worth clearing up. \u003cstrong\u003eCan neon tetras eat betta food\u003c\/strong\u003e? Sometimes, but most betta foods are too large and protein-heavy for regular use. \u003cstrong\u003eCan neon tetras eat betta pellets\u003c\/strong\u003e? Only if crushed very finely, and still not as the main diet. \u003cstrong\u003eDo neon tetras eat algae\u003c\/strong\u003e? Not in any useful way; they are not algae cleaners. \u003cstrong\u003eDo neon tetras eat shrimp\u003c\/strong\u003e? Adult shrimp are usually safe, but shrimplets may be eaten. \u003cstrong\u003eDoes neon tetra eat guppy fry\u003c\/strong\u003e? Small fry may be taken if they fit in the mouth, so do not rely on cardinals as fully fry-safe fish.\u003c\/p\u003e\n\u003cdiv class=\"food-recommendation\"\u003e\n  \u003ca href=\"\/products\/cardinal-tetras\"\u003eCardinal Tetras - Paracheirodon Axelrodi\u003c\/a\u003e - Ideal for aquarists planning a dedicated shoal and wanting to expand an existing group with matching species and size profile.\n\u003c\/div\u003e\n\u003cdiv class=\"food-recommendation\"\u003e\n  \u003ca href=\"\/products\/cardinal-tetra\"\u003eCardinal Tetras\u003c\/a\u003e - A great option if you are building a larger display and want a stronger, more natural schooling effect.\n\u003c\/div\u003e\n\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\u003eVery small pinch, eaten within 30-60 seconds\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\u003eSmall portion, no leftovers\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"warning-box\"\u003e\n  \u003ch4\u003e⚠️ Feeding Warning\u003c\/h4\u003e\n  \u003cp\u003eOverfeeding causes ammonia spikes, cloudy water, and digestive stress. Small tetras do best with tiny portions offered consistently, not large meals dropped in all at once.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"appearance\"\u003eWhat Do Cardinal Tetras Look Like? Colors, Patterns \u0026amp; Varieties\u003c\/h2\u003e\n\u003cp\u003eThe classic appeal of Cardinal Tetras is their clean, high-contrast colour pattern. A brilliant blue iridescent stripe runs from the snout to the tail, while the red band extends along nearly the full lower half of the body. This full-length red is the easiest way to separate them in the \u003cstrong\u003ecardinal tetra vs neon tetra\u003c\/strong\u003e debate. On a true neon tetra, the red usually covers only the rear half of the body.\u003c\/p\u003e\n\u003cp\u003eTypical \u003cstrong\u003ecardinal tetras size\u003c\/strong\u003e in home aquariums is around 3-5 cm, with \u003cstrong\u003eneon tetra size\u003c\/strong\u003e usually slightly smaller on average. If you are comparing \u003cstrong\u003ecardinal tetra size\u003c\/strong\u003e against other small tetras, cardinals have a more elongated, elegant look and often appear larger because of the bold colour coverage. In a dark aquascape, they can look almost luminous, which explains why people ask \u003cstrong\u003ewhat makes neon tetras glow\u003c\/strong\u003e. The effect comes from structural iridescence in special reflective cells, not true bioluminescence.\u003c\/p\u003e\n\u003cp\u003eThere is only limited sexual dimorphism, but \u003cstrong\u003ecardinal tetras male vs female\u003c\/strong\u003e can often be judged by body shape. Females are usually a little fuller, especially when carrying eggs, while males are slimmer and may appear slightly straighter along the belly line. If a fishkeeper asks \u003cstrong\u003ewhy neon tetra is losing color\u003c\/strong\u003e, the most common causes are stress, transport, poor water quality, bright exposure, or illness.\u003c\/p\u003e\n\u003cp\u003eSome hobbyists also compare cardinals to the \u003cstrong\u003egreen neon tetra\u003c\/strong\u003e, which is smaller and more subtle. Cardinals are the bolder show fish, especially in larger schools. Our photos show the intense red-blue contrast best achieved with dark substrate, soft lighting, and a settled group in a mature aquarium.\u003c\/p\u003e\n\n\u003ch2 id=\"compatibility\"\u003eWhat Fish Can Live With Cardinal Tetras? Compatibility Guide\u003c\/h2\u003e\n\u003cp\u003eOne reason Cardinal Tetras are often called the \u003cstrong\u003ebest tetra for community tank\u003c\/strong\u003e setups is their peaceful nature. They are not fin nippers in the way some larger or more boisterous tetras can be. So, \u003cstrong\u003eare neon tetras aggressive\u003c\/strong\u003e? Usually no, and the same applies here. \u003cstrong\u003eIs neon tetra aggressive\u003c\/strong\u003e is another common search, but in a proper group, cardinals are calm, social fish. A stressed or undersized shoal may become skittish, but not truly aggressive.\u003c\/p\u003e\n\u003cp\u003eThe best \u003cstrong\u003ecardinal tetras tank mates\u003c\/strong\u003e are other peaceful fish that enjoy similar warm, soft water. Good examples include Corydoras, small rasboras, pencilfish, peaceful dwarf cichlids, and other gentle tetras. If you are asking \u003cstrong\u003ewhat can neon tetras live with\u003c\/strong\u003e, the answer overlaps heavily with \u003cstrong\u003ecardinal tetra tank mates\u003c\/strong\u003e. A well-planned \u003cstrong\u003eneon tetra community tank\u003c\/strong\u003e can easily be adapted for cardinals.\u003c\/p\u003e\n\u003cp\u003eSuitable companions from our range include \u003ca href=\"\/products\/glowlight-tetras\"\u003eGlowlight Tetras - Hemigrammus Erythrozonus\u003c\/a\u003e, \u003ca href=\"\/products\/pristella-maxillaris\"\u003eX-Ray Tetras - Pristella Maxillaris -\u003c\/a\u003e, and \u003ca href=\"\/products\/ember-tetras\"\u003eEmber Tetras - Hyphessobrycon Amandae\u003c\/a\u003e. If you want to compare closely related species, see \u003ca href=\"\/products\/neon-tetra\"\u003eNeon Blue Tetra Tropical Fish\u003c\/a\u003e. For larger tetra mixes, use caution with \u003ca href=\"\/products\/buenos-aires\"\u003eBuenos Aires Tetra - Hyphessobrycon Anisitsi\u003c\/a\u003e, as they are much more robust and can outcompete smaller fish.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMixing neon and cardinal tetras\u003c\/strong\u003e is possible and often attractive, but make sure the tank is large enough and the water is warm enough for cardinals. This is one of the most common questions from keepers planning \u003cstrong\u003eneons cardinals and glowlights\u003c\/strong\u003e together. It can work in a spacious, planted aquarium with stable parameters and careful stocking.\u003c\/p\u003e\n\u003cp\u003eSpecific compatibility questions come up all the time. \u003cstrong\u003eCan neon tetras and guppies live together\u003c\/strong\u003e? Sometimes, but guppies prefer harder, more alkaline water than cardinals. \u003cstrong\u003eCan neon tetras live with guppies\u003c\/strong\u003e? Possible, but not ideal if you are trying to keep cardinals in soft acidic conditions. \u003cstrong\u003eCan neon tetras live with mollies\u003c\/strong\u003e? Usually not recommended for the same reason. \u003cstrong\u003eCan neon tetras live with goldfish\u003c\/strong\u003e? No, goldfish need cooler water and may eat them. \u003cstrong\u003eCan neon tetras live with angelfish\u003c\/strong\u003e? Only with caution; adult angels may prey on them. \u003cstrong\u003eCan neon tetras live with bettas\u003c\/strong\u003e? Sometimes, if the betta is calm and the tank is spacious. \u003cstrong\u003eCan neon tetras live with shrimp\u003c\/strong\u003e? Adult shrimp often do fine, but shrimplets may be hunted.\u003c\/p\u003e\n\u003cp\u003eFor those searching \u003cstrong\u003eneon tetra 10 gallon tank mates\u003c\/strong\u003e, remember that Cardinal Tetras are better in 60 litres and above, especially if mixing species. They are much more impressive and secure in a larger shoal than in a cramped nano setup.\u003c\/p\u003e\n\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\/ember-tetras\"\u003eEmber Tetras - Hyphessobrycon Amandae\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd\u003e✅ Yes\u003c\/td\u003e\n      \u003ctd\u003ePeaceful, similar temperament, works well in planted soft-water tanks\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003ca href=\"\/products\/glowlight-tetras\"\u003eGlowlight Tetras - Hemigrammus Erythrozonus\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd\u003e✅ Yes\u003c\/td\u003e\n      \u003ctd\u003eExcellent for larger shoaling displays with warm, calm conditions\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAngelfish\u003c\/td\u003e\n      \u003ctd\u003e⚠️ Caution\u003c\/td\u003e\n      \u003ctd\u003eMay work when young, but adults can see small tetras as food\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eGoldfish\u003c\/td\u003e\n      \u003ctd\u003e❌ Avoid\u003c\/td\u003e\n      \u003ctd\u003eDifferent temperature needs and predation risk\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\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 your Cardinal Tetras from parasites, bacterial infections, and stress-related losses.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"breeding\"\u003eHow Do You Breed Cardinal Tetras? Complete Breeding Guide\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCardinal tetras breeding\u003c\/strong\u003e is considered difficult, which is why many aquarists ask \u003cstrong\u003edo cardinal tetras breed easily\u003c\/strong\u003e. The honest answer is no, not compared with livebearers or many egg scatterers. Still, \u003cstrong\u003ebreeding cardinal tetras\u003c\/strong\u003e is possible with the right setup, patience, and very soft acidic water. If you want to \u003cstrong\u003ebreed cardinal tetras\u003c\/strong\u003e successfully, treat it as an advanced project rather than a casual side goal.\u003c\/p\u003e\n\u003ch3\u003eBreeding Setup\u003c\/h3\u003e\n\u003cp\u003eA separate spawning tank is strongly recommended. Use dim lighting, very soft water, pH around 5.0-6.0, and temperature near the upper end of the range. Fine-leaved plants or spawning mops give the pair a place to scatter eggs. This is the foundation of \u003cstrong\u003ehow to breed cardinal tetras\u003c\/strong\u003e and also mirrors advice given for \u003cstrong\u003eneon tetra how to breed\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eSpawning Behaviour\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eParacheirodon axelrodi breeding\u003c\/strong\u003e behaviour usually begins after conditioning with live or frozen foods. Males pursue fuller females through plants. If you are wondering \u003cstrong\u003ehow do you know when a neon tetra is going to lay eggs\u003c\/strong\u003e, the same clues apply here: females become rounder, males intensify in colour, and the group becomes more active in the early hours. Many fishkeepers ask \u003cstrong\u003ewhen do neon tetras breed\u003c\/strong\u003e, \u003cstrong\u003ewhen do neon tetras lay eggs\u003c\/strong\u003e, \u003cstrong\u003ewhen neon tetras lay eggs\u003c\/strong\u003e, \u003cstrong\u003ewhat day neon tetras lay eggs\u003c\/strong\u003e, or \u003cstrong\u003ewhat time neon tetras lay eggs\u003c\/strong\u003e. In practice, spawning usually happens at dawn or shortly after lights come on in a quiet, dim environment.\u003c\/p\u003e\n\u003ch3\u003eEgg Care \u0026amp; Hatching\u003c\/h3\u003e\n\u003cp\u003eThe eggs are light-sensitive, so keep the tank very dark. Adults should be removed after spawning because they may eat the eggs. This also answers \u003cstrong\u003ewhere do neon tetras lay eggs\u003c\/strong\u003e: among fine plants, moss, or spawning media where the eggs can fall out of reach. Hatching normally occurs within about 24-36 hours, depending on temperature.\u003c\/p\u003e\n\u003ch3\u003eFry Care \u0026amp; Growth\u003c\/h3\u003e\n\u003cp\u003eNewly hatched fry are tiny and need infusoria or specialist liquid fry food before moving on to baby brine shrimp. This is why \u003cstrong\u003eneon tetra breeding\u003c\/strong\u003e and \u003cstrong\u003eparacheirodon innesi breeding\u003c\/strong\u003e are often considered delicate. The fry are sensitive to sudden changes and need immaculate water quality.\u003c\/p\u003e\n\u003cdiv class=\"tip-box\"\u003e\n  \u003ch4\u003eAdvanced Breeding Tip\u003c\/h4\u003e\n  \u003cp\u003eFor the best chance of success with \u003cstrong\u003eparacheirodon axelrodi breeding\u003c\/strong\u003e, use reverse osmosis water remineralised very lightly, keep conductivity low, and shield the breeding tank from all direct light for the first few days after spawning.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"comparison\"\u003eCardinal Tetras vs Similar Species: Which Should You Choose?\u003c\/h2\u003e\n\u003cp\u003eThe most common comparison is \u003cstrong\u003ecardinal tetra vs neon tetra\u003c\/strong\u003e. Both are beautiful, peaceful shoaling fish, but they suit slightly different setups. Cardinals are often chosen by aquarists who want richer red colour, slightly warmer water, and a more dramatic blackwater display. Neons are a little more forgiving in cooler community tanks, though neither species likes unstable water.\u003c\/p\u003e\n\u003ctable class=\"comparison-table\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eCardinal Tetras\u003c\/th\u003e\n\u003cth\u003eNeon Tetras\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Size\u003c\/td\u003e\n\u003ctd\u003eUp to 5 cm\u003c\/td\u003e\n\u003ctd\u003eAround 4 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCare Level\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003ctd\u003eEasy to moderate\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature\u003c\/td\u003e\n\u003ctd\u003e23-27°C\u003c\/td\u003e\n\u003ctd\u003e21-25°C typical\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003eVaries by group size\u003c\/td\u003e\n\u003ctd\u003eUsually slightly lower\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBest For\u003c\/td\u003e\n\u003ctd\u003eWarm planted or blackwater shoals\u003c\/td\u003e\n\u003ctd\u003eClassic community tanks\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eIf you want a stronger red band and a more luxurious Amazon look, choose Cardinals. If you are stocking a cooler mixed tetra aquarium, standard neons may be easier. For alternatives, \u003ca href=\"\/products\/neon-tetra\"\u003eEnhance Your Aquarium with 6 X\u003c\/a\u003e offers the classic neon look, while \u003ca href=\"\/products\/ember-tetras\"\u003eEmber Tetras - Hyphessobrycon Amandae\u003c\/a\u003e gives a warmer orange glow in nano-friendly planted layouts. Hobbyists also compare cardinals with the \u003cstrong\u003egreen neon tetra\u003c\/strong\u003e, which stays smaller and has a subtler, greener-blue shimmer.\u003c\/p\u003e\n\u003cp\u003eFor anyone building a visual schooling display, cardinals are often the better choice. They hold formation tightly, show stronger contrast over dark substrate, and create that unmistakable riverine flash that makes a mature tetra tank so compelling.\u003c\/p\u003e\n\n\u003ch2 id=\"health\"\u003eWhat Are the Common Health Problems in Cardinal Tetras and How Can You Prevent Them?\u003c\/h2\u003e\n\u003cp\u003eStrong \u003cstrong\u003ecardinal tetras health\u003c\/strong\u003e starts with stable water, low stress, and careful acclimation. Healthy fish swim in a coordinated group, hold bright colour, feed eagerly, and do not clamp their fins. If they hide constantly, breathe rapidly, lose colour, or isolate themselves, check water quality first.\u003c\/p\u003e\n\u003cp\u003eThe issue most people ask about is \u003cstrong\u003ewhat is neon tetra disease\u003c\/strong\u003e. This term is often used for a wasting condition linked to a microsporidian parasite, though hobbyists sometimes use it loosely for several similar-looking problems. Typical searches include \u003cstrong\u003ewhat is neon tetra disease symptoms\u003c\/strong\u003e, \u003cstrong\u003ewhat causes neon tetra disease\u003c\/strong\u003e, and \u003cstrong\u003edoes neon tetra disease affect other fish\u003c\/strong\u003e. Symptoms may include fading colour, bent spine, erratic swimming, cyst-like lumps, and progressive weakness. Unfortunately, true cases are difficult to treat and infected fish should be removed quickly.\u003c\/p\u003e\n\u003cp\u003eOther \u003cstrong\u003ecardinal tetras diseases\u003c\/strong\u003e include ich, bacterial fin damage, fungal infections after stress, and internal wasting caused by poor diet or parasites. \u003cstrong\u003eCardinal tetra disease\u003c\/strong\u003e is not a single diagnosis, so it is important to look at the full picture: water test results, recent additions, feeding response, and whether multiple species are affected.\u003c\/p\u003e\n\u003cp\u003eIf you are searching for \u003cstrong\u003ewhich neon tetra care\u003c\/strong\u003e, the best care is preventative care. Keep the aquarium mature, avoid sudden pH swings, feed a varied diet, and do not crowd them with rough tank mates. Imported fish can be sensitive during the first week, so dim lighting and gentle acclimation make a big difference. Some keepers search terms like \u003cstrong\u003etetra neon ficha\u003c\/strong\u003e or \u003cstrong\u003etetra cardenal ficha\u003c\/strong\u003e for a quick species sheet; the key points are always the same: soft water, warmth, clean conditions, and a proper group size. For blackwater hobbyists, even \u003cstrong\u003etetra cardenal ph\u003c\/strong\u003e becomes a major focus because extremes of alkalinity can stress this species badly.\u003c\/p\u003e\n\u003cdiv class=\"warning-box\"\u003e\n  \u003ch4\u003e⚠️ Health Warning\u003c\/h4\u003e\n  \u003cp\u003eNever medicate blindly. Test water first, isolate sick fish when possible, and remember that many small tetras react poorly to overdosed treatments. If shrimp are present, NEVER use copper-based medications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"info-box\"\u003e\n  \u003ch4\u003eQuarantine Protocol\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003eUse a separate tank for 2-4 weeks\u003c\/li\u003e\n    \u003cli\u003eObserve feeding, colour, and swimming daily\u003c\/li\u003e\n    \u003cli\u003eTest ammonia, nitrite, and temperature regularly\u003c\/li\u003e\n    \u003cli\u003eKeep lighting subdued to reduce stress\u003c\/li\u003e\n    \u003cli\u003eOnly introduce fish once they are stable and feeding well\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"behavior\"\u003eHow Do Cardinal Tetras Behave in the Aquarium?\u003c\/h2\u003e\n\u003cp\u003eCardinals are classic shoaling fish. They spend most of their time in the middle of the tank, weaving in and out of plants and tightening into a group when startled. If you want to see their best behaviour, keep them in a proper school rather than a token handful. This is the real answer to \u003cstrong\u003ehow many cardinal tetras should be kept together\u003c\/strong\u003e: 10 is the minimum, and more looks better.\u003c\/p\u003e\n\u003cp\u003eThey are peaceful, alert, and responsive to changes in light. In the morning, the group often colours up and becomes more active. In heavily planted aquariums, they move between cover and open water in a very natural rhythm. These fish are not flashy in an aggressive sense; their appeal comes from coordinated movement and colour contrast.\u003c\/p\u003e\n\u003cp\u003eAs a result, many aquarists consider them a centrepiece shoal rather than a single “feature fish.” If you enjoy observing natural schooling, subtle social cues, and the way fish use space in a planted tank, Cardinals are deeply rewarding. They are also a great species for anyone building a broader \u003cstrong\u003eguide to tetras\u003c\/strong\u003e collection and wanting a true Amazon classic.\u003c\/p\u003e\n\n\u003ch2 id=\"why-buy\"\u003eWhy Buy Cardinal Tetras from Tropical Fish Co?\u003c\/h2\u003e\n\u003cp\u003eWhen people search \u003cstrong\u003ecardinal tetra for sale\u003c\/strong\u003e, \u003cstrong\u003ecardinal tetras for sale\u003c\/strong\u003e, \u003cstrong\u003ebuy cardinal tetras UK\u003c\/strong\u003e, or \u003cstrong\u003ewhere to buy cardinal tetras UK\u003c\/strong\u003e, they are usually comparing more than just price. With Cardinals, condition on arrival matters enormously. This species can be sensitive to poor packing, temperature swings, and rough handling, so careful preparation is not a luxury; it is essential.\u003c\/p\u003e\n\u003cp\u003eOur Cardinal Tetras are selected for strong body colour, intact finnage, and active schooling behaviour before dispatch. We do not treat them like a generic small tetra line. Groups are assessed for feeding response and overall balance so you receive fish that settle more predictably into a mature aquarium. If you are comparing \u003cstrong\u003ecardinal tetras price UK\u003c\/strong\u003e against the real value of healthy stock, this is where quality shows.\u003c\/p\u003e\n\u003cp\u003eFor customers looking for \u003cstrong\u003ecardinal tetras for sale UK\u003c\/strong\u003e, \u003cstrong\u003ecardinal tetras online UK\u003c\/strong\u003e, \u003cstrong\u003eorder cardinal tetras UK\u003c\/strong\u003e, or \u003cstrong\u003ecardinal tetras delivery UK\u003c\/strong\u003e, fish are packed in insulated boxes with professional bagging methods and seasonal heat protection when needed. Tracked delivery reduces transit uncertainty, and acclimation guidance is included so you can match temperature and water chemistry carefully on arrival.\u003c\/p\u003e\n\u003cp\u003eBuyers also search \u003cstrong\u003echeap cardinal tetras UK\u003c\/strong\u003e and \u003cstrong\u003ecardinal tetras shop UK\u003c\/strong\u003e, but the cheapest fish are rarely the best value if they arrive stressed or underconditioned. If you want to \u003cstrong\u003ebuy tetra UK\u003c\/strong\u003e with confidence, choose fish that have been handled with the needs of this species in mind. For expanding an established shoal, you can also view \u003ca href=\"\/products\/cardinal-tetras\"\u003eCardinal Tetras - Paracheirodon Axelrodi\u003c\/a\u003e or \u003ca href=\"\/products\/cardinal-tetra\"\u003eCardinal Tetras\u003c\/a\u003e as related options.\u003c\/p\u003e\n\u003cdiv class=\"care-highlight\"\u003e\n  \u003ch4\u003eWhy Choose Tropical Fish Co for Cardinal Tetras\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003eGroups are selected for visible colour, schooling response, and overall condition rather than sold as mixed, unassessed stock\u003c\/li\u003e\n    \u003cli\u003ePacked with insulation and seasonal heat protection to help warm-water tetras travel safely in UK conditions\u003c\/li\u003e\n    \u003cli\u003eIdeal for aquarists creating planted Amazon-style communities with soft-water compatible species\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"related-products\"\u003eYou Might Also Like\u003c\/h2\u003e\n\u003cp\u003eTo build a balanced tetra community, compare these related species and shoaling options. For the classic close relative, see \u003ca href=\"\/products\/neon-tetra\"\u003eNeon Blue Tetra Tropical Fish\u003c\/a\u003e. For warm orange contrast, \u003ca href=\"\/products\/ember-tetras\"\u003eEmber Tetras - Hyphessobrycon Amandae\u003c\/a\u003e work beautifully in planted tanks. If you want a brighter line effect, \u003ca href=\"\/products\/glowlight-tetras\"\u003eGlowlight Tetras - Hemigrammus Erythrozonus\u003c\/a\u003e are a natural partner in larger displays. \u003ca href=\"\/products\/pristella-maxillaris\"\u003eX-Ray Tetras - Pristella Maxillaris -\u003c\/a\u003e offer a slightly hardier mixed-community option, while \u003ca href=\"\/products\/buenos-aires\"\u003eBuenos Aires Tetra - Hyphessobrycon Anisitsi\u003c\/a\u003e suit more robust setups. If you are ready to expand your shoal, return to \u003ca href=\"\/products\/cardinal-tetras\"\u003eCardinal Tetras - Paracheirodon Axelrodi\u003c\/a\u003e for a coordinated group.\u003c\/p\u003e","brand":"Tropical Fish Co","offers":[{"title":"1 - 1,3 cm","offer_id":57469605314895,"sku":"2227","price":2.54,"currency_code":"GBP","in_stock":true},{"title":"1,3 - 1,7 cm","offer_id":57470136680783,"sku":"2229","price":3.39,"currency_code":"GBP","in_stock":true},{"title":"1,7 - 2 cm","offer_id":57470136713551,"sku":"2230","price":3.39,"currency_code":"GBP","in_stock":true},{"title":"2 - 2,5 cm","offer_id":57470136746319,"sku":"2231","price":2.54,"currency_code":"GBP","in_stock":true},{"title":"2,5 - 3 cm","offer_id":57470136779087,"sku":"2232","price":3.39,"currency_code":"GBP","in_stock":true},{"title":"3 - 3,5 cm","offer_id":57470136811855,"sku":"2233","price":5.09,"currency_code":"GBP","in_stock":true},{"title":"3,5 - 4 cm","offer_id":57470136844623,"sku":"2234","price":5.09,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/1408\/6735\/files\/cardinal-tetras-x-cardinal-tetras-paracheirodon-axelrodi-south-american-hero-driftwood-2227.webp?v=1776546080","url":"https:\/\/tropical-fish-co.myshopify.com\/products\/cardinal-tetras-neon-uk","provider":"Tropical Fish Co","version":"1.0","type":"link"}