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Black Widow tetra

Picture of Black Widow Tetra Picture of Black Widow Tetra

Photos taken at Wharf Aquatics
© Sean Evans

Common name:Black Widow tetra, Black tetra
Scientific name:Gymnocorymbus ternetzi
Size:Around 2" (5cm) or slightly larger.
Origin:South America: Brazil and Paraguay.
Tank setup:A planted tank, with open swimming space.
Compatibility:Generally a peaceful community fish - long-finned varieties may fall victim to fin nippers. Occasionally known to nip the fins of other fish, but this is not normally a problem when kept as a shoal.
Temperature:21-27oC (70-81oF)
Water chemistry:A wide range tolerated, but soft and slightly acidic (pH 6.0-7.0) prefered.
Feeding:Omnivorous: live, frozen and dry foods.
Sexing:Females are slightly larger with a rounder body. Males may show white spots on the tail fin.
Breeding:Eggs are scattered among fine-leaved plants and hatch in about a day. Being a typical egg scatterer, the parents will eat the eggs if given the opportunity.
Comments: An undemanding species which is often recommended for the beginner. A number of colour and long-finned varieties have been produced.



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