It is important to keep Pygocentrus piranhas alone or in groups of four or more, not in pairs, since aggression among them is common, not allowing the weaker fish to survive, and is distributed more widely when kept in larger groups.
É importante manter as pirañas Pygocentrus soas ou en grupos de catro ou máis, non en pares, xa que a agresión entre elas é común, e non permiten sobrevivir ás débiles.