A 30-gallon or larger aquarium with a cave and peaceful tank mates is suitable for this slow and methodical swimmer. It tends to hide in sea grass or may use long spined urchins for camouflage. If a larger aquarium is available, it will handle a small group of this species. As a group, they will establish a strict hierarchy without aggressiveness.
The Redtail Cardinalfish requires a well balanced diet of meaty foods such as frozen brine or mysis shrimp, flake foods, pellet foods, and bloodworms.
Approximate Purchase Size: Small: 3/4" to 1-1/4"; Medium,: 1-1/4" to 2"; Large: 2" to 3"