Black Widow Tetra Tropical Fish Information

Gymnocorymbus ternetzi
Black Widow Tetra
Behaviour Peaceful but may nip long-finned fish
Typical size 4cm
Max size 6cm
Tank Area Middle, top
Min Tank Size 60cm
Min Number 5
Temp Min: 20℃ Max: 26℃
Feeding Flake, frozen, live foods
pH Range 5.5-8.5
Hardness vs,s,m,h,vh
Black Widow Tetra Gymnocorymbus ternetzi
  • Black Widow Tetra Gymnocorymbus ternetzi - thumbnail
  • Black Widow Tetra Gymnocorymbus ternetzi - thumbnail

Black Widow Tetra (Gymnocorymbus ternetzi)

Black Widow Tetra Tropical Fish Learn all about the Black Widow Tetra's feeding habits and food types, its behaviour, its origins, its natural habitats, is it male or female, breeding advice and information, suitable tank mates, its sizing and growth range, minimum tank size, water PH and more. Use our fish community creator tool to plan your tank set up and ensure that the Black Widow Tetra is the right fish for your aquarium.

The Black Widow Tetra is a peaceful shoaling fish, which is very hardy and suited to a wide range of water conditions. After around a year, the black colour begins to fade to a washed out grey appearance and the fish no longer shoals, preferring its own space. Although very peaceful, the Black Widow Tetra will nip at long finned fish such as Guppies or Siamese Fighting Fish. Keep in aquariums with some hiding spots amongst plants. A good aquarium fish.

Black Widow Tetra Facts

Family Characidae (Characins) | Synonyms Tetragonopterus ternetzi, Gymnocothymbus ternetzii | Other names Black tetra, butterfly tetra | Origin South America; Paraguay and Guapore River basins | Breeding Egg scatterer | Natural Water Conditions pH 6-8, very soft to medium | Sexing Males dorsal fin is pointed and narrow whilst the anal fin is broader.



Black Widow Tetra Help and Advice

If you have a question about keeping Black Widow Tetra's then please use our Black Widow Tetra help forum. Join 100's of other fish enthusiasts with 1000's of years experience between them caring for and keeping fish like these.


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Check Tankmates for the Black Widow Tetra fish species

Create a test community that includes the Black Widow Tetra fish species and other types you'd like to introduce - Assess tank size suitability based on filter type and volume, possible negative interactions and warnings.

Please check your water type for compatibility with your fish, which can be found on the Black Widow Tetra information box.
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If you'd like to talk about the "Black Widow Tetra" with our users, then we have a buzzing community of fish enthusiasts where you can talk about tank issues, Black Widow Tetra fish behaviour, Black Widow Tetra tank stocking and any other issues related to the Black Widow Tetra fish or other types you may have.

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