Buenos Aires Tetra

About

A fish with no widely accepted common name, Hyphessobrycon anisitsi is a mid-sized tetra from the Paraná and Uruguay River basins of South America, where it inhabits ponds and slow-moving waters. It can grow notably larger than many of its relatives in the aquarium trade, reaching over five inches in some cases, which is worth keeping in mind when choosing tankmates and planning space. Coloration is fairly classic tetra-style, and an albino strain, sometimes sold as 'golden', has been developed through selective breeding and turns up regularly in the hobby. What really defines this species for most keepers is its temperament: it is boisterous, socially complex, and has a well-documented tendency to nip fins when kept in small numbers or cramped quarters. In a group of eight or more, individuals spend much of their energy establishing pecking order among themselves, which keeps aggression redirected and also brings out better color in males competing for attention. Shy, slow-moving, or long-finned fish are not good neighbors, but robust open-water characins, callichthyid and loricariid catfishes, and similarly active species tend to do well alongside it. On the positive side, this is genuinely one of the more forgiving tetras for newer fishkeepers, tolerating a wide range of water conditions without complaint.