The azureus cichlid is a plankton-feeder from Lake Malawi in Africa. As they mature, the males turn from silver to electric blue. The flashier, the better, to seduce the females and ward off other males.
Azureus Cichlid
Copadichromis azureus

The azureus cichlid is a plankton-feeder from Lake Malawi in Africa. As they mature, the males turn from silver to electric blue. The flashier, the better, to seduce the females and ward off other males.