Who can share a tank?
Mixing the wrong species is a fast way to lose stock - to fighting, to predation, or simply to one animal needing cold water while another needs warm. Pick a species and we'll show what it can safely live with and what to keep well apart.
⚠️ A starting guide, not a rule for every tank. Temperament varies between individuals, and space, hiding places and feeding all change the picture - breeding season in particular makes many peaceful fish aggressive. When in doubt, keep species separate and watch closely before committing.