The Flame Cardinal is a great addtion to a fish tank. These fish like to swim in a stationary motion needing little effort. The Flame Cardinal is nocturnal it likes rockwork with overhangs that it can feel comfortable under during the day, but will stay in full view. They will accept most fish foods and prefer to be kept in groups. The family of Cardinalfish are a group of relatively small fish that like to inhabit reef overhangs and crevices. These fish are nocturnal and do most of their feeding at nightime. They usually have large eyes, two separated dorsal fins, and short snouts. Size varies 2-4 inches. Diet is Brine, Mysis, Pellet, Flake, keep an eye out if you have small shrimp in your tank.