Black Widow Tetra
The Black Widow Tetra (Gymnocorymbus ternetzi), is sometimes called the Black skirt tetra, and the High Fin black skirt tetra.
The Black Widow Tetra originates from Bolivia and Paraguay and can be found in streams and rivers. Adults reach 5cm in length and the female is the larger of the two with fuller bodies. This fish swims in the middle level of the tank and will eat all foods including live food. Because it is an egg scaterer the breeding potential is low.
This is an inexpensive fish and is often available in local fish stores. It is hardy by nature and a very popular fish. One of the problems with these fish is that the adult will lose coloration as they get older resulting in a silver fish. Avoid introducing this fish into a tank with long fined fish because they will nip at them.
A group will do well in the aquarium and this can be considered a community fish. They will benefit form a water temperature between 22-28 degrees centigrade and soft and acidic to hard and alkaline water.
This fish is plant friendly and is hardier than other tetras, and is not too fussy with water conditions and specific water temperatures.