Most aquarium fish fit into one of the categories below, but some don't. For the full list please see the alphabetical fish index, or search for fish by country of origin.
Too many fish? Overstocked tanks stress the fish in many ways: competition for food and space, bullying from other fish, deterioration of water quality and increased concentration of disease vectors. A lightly stocked tank will always be easier to care for, with more stable water quality
