Easy to care for. Semi Aggressive, Fin Nipper The Buenos Aires Tetra originates from the Paraná and Uruguay River basins. This is in the region of Buenos Aires, Argentina. They are known by the scientific name Hemigrammus caudovittatus and by Hyphessobrycon anisitsi. They are one of the hardiest tetras and are easy to keep but are not a favorite of plant lovers, because of their propensity to eat them. Buenos Aires Tetras have a clear body with a thin blue line through from the gills to the caudal fin. The caudal and lower fins have an orange tint. There is a dark area at the base of the caudal fin. Coloring is brighter during spawning. There is also an Albino Buenos Aires variety. Buenos Aires Tetras are one of the more aggressive tetras and they will nip fins. They should be kept with aggressive larger tetras, such as the Blind Cave Tetra, the Colombian Tetra, the Serpae Tetra and the Silver Tip Tetra. They are definitely not good companions for smaller tetras and guppies. They should be kept in groups of at least 6 to reduce aggression. They need lots of open swimming space, as they are very active. Rocks and driftwood will be appreciated. Plants should be plastic unless you intend them to be eaten, though Java Fern may survive.