Native to the deep-water reefs of the Caribbean, this member of the Grammidae family prefers extensive rockwork caves in which to hide and somewhat subdued lighting. Since it demonstrates territorial aggression towards its own kind, the Royal Gramma Basslet should be housed singly. However, most Royal Gramma Basslets are peaceful towards tankmates of similar size and temperament.

For the best care, keep the Royal Gramma Basslet in reef systems of at least 30 gallons. Since it is a carnivore, feed a varied diet of meaty fare, including marine fish, crustacean flesh, mysis shrimp, and quality frozen preparations.