Gold Widow long fin — Black Widow Tetra (Gymnocorymbus ternetzi)
Gold Widow long fin — Black Widow Tetra (Gymnocorymbus ternetzi)
The Black Widow Tetra (Gymnocorymbus ternetzi) is a dramatic black and silver tetra, also available in gold variety. Originating from South America (Paraguay, Guapore basins), this peaceful species is rated as easy care level and can live up to 5 years with proper husbandry.
Care at a Glance
| Scientific Name | Gymnocorymbus ternetzi |
| Family | Characidae |
| Origin | South America (Paraguay, Guapore basins) |
| Care Level | easy |
| Temperament | peaceful |
| Adult Size | 6 cm |
| Minimum Tank Size | 60 litres |
| Temperature | 22–28°C |
| pH Range | 6.0–7.5 |
| Water Hardness | 5–20 dGH |
| Diet | Omnivore; flakes, pellets, frozen foods |
| Lifespan | 5 years |
| Tank Region | middle |
| Group Size | 6+ (schooling) |
Origin & Natural Habitat
The Black Widow Tetra hails from South America (Paraguay, Guapore basins). Black Widow Tetras are hardy, active schooling fish. The Gold variety (Gold Widow) is equally popular. May nip long fins occasionally.
Tank Setup & Water Parameters
Provide a minimum of 60 litres for your Black Widow Tetra. Adults reach approximately 6 cm, so plan accordingly. Maintain water temperature between 22–28°C with a pH of 6.0–7.5 and hardness of 5–20 dGH. This species primarily occupies the middle region of the aquarium. Recommended group size: 6+ (schooling).
Feeding Guide
The Black Widow Tetra is an omnivore. Omnivore; flakes, pellets, frozen foods. Feed small portions twice daily for optimal health and colouration.
Compatible Tank Mates
Good companions for the Black Widow Tetra include Other tetras, Corydoras, Rasboras. Avoid housing with Long-finned fish. You might also consider species such as Filter Foam Rough 10 PPI, X Pretty Tetras, Tropical Plastic Cone for Discus from our collection.
Why Buy from Tropical Fish Co?
At Tropical Fish Co, every fish is carefully selected and shipped with care across the UK. We offer live arrival guarantee, expert advice, and competitive prices. Order your Black Widow Tetra today and enjoy next-day delivery to your door.