The Buenos Aires tetra (Psalidodon anisitsi)[3] is a tropical fish from South America.

The Buenos Aires tetra originates from South America, where they are widespread throughout the Río de la Plata Basin in Argentina, Paraguay, Uruguay, and southeastern Brazil.

[4] Despite the common name, they are not endemic to its namesake, Buenos Aires Province; and a similar looking fish, Hyphessobrycon togoi largely replaces it here.

Its silver color picks up flashy neon highlights depending on how the light hits the fish.

Its most distinguishing characteristic is the caudal peduncle, or the connecting area between the tail and the rest of the body, which features a bold, black 'cross' shape.

In the wild they feed on worms, crustaceans, insects, and plants, but in the aquarium they will generally eat all kinds of live, fresh, and flake foods.

To keep these tetras at their best and most colorful, offer regular meals of live and frozen foods, such as bloodworms, Daphnia, and brine shrimp.