A very peaceful schooling fish suitably sized for smaller aquariums. They are sometimes called polka-dot cardinalfish due to a pattern of round spots on the posterior part of their body. They have a greenish-yellow face, bright orange eyes, and a silver-based body dressed with a bold black scalar margin and a posterior dotted with orange polka-dots. The “polka-dots” are black on early juvenile fish, but turns red as the fish grow. An interesting fact about the Pajama Cardinals is that they are mouth brooders. After the eggs are fertilized the male picks them up and guard the eggs in his mouth until they hatch. After the eggs hatch the male “spits out” the juvenile fish and they are on their own.