Fish Database: Black Widow Tetra - Gymnocorymbus ternetzi
Aquarium requirements
Aquarium suitability: 5/5
Sociability rating: 8/10
Area of tank: Middle, top
Aquarium water conditions: 5.5-8.5, vs,s,m,h,vh
Temperature: 20 - 26C
Feeding: Flake, frozen, live foods
Minimum tank size: 60cm
Min / Max number in tank: Min 5
Fish fact file
Family: Characidae (Characins)
Synonyms: Tetragonopterus ternetzi, Gymnocothymbus ternetzii
Other common names: Black tetra, butterfly tetra
Origin: South America; Paraguay and Guapore River basins
Natural habitat:
Size: 6cm
Behavior: Peaceful but may nip long-finned fish
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
Fish code No.0902
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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.
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