The Giant Damselfish, Microspathodon dorsalis is a rare and unique fish species that is not commonly seen in the trade due to its aggressive nature. It is not recommended in a peaceful community fish in most home aquariums, and should only be housed with other aggressive fishes such as dottybacks, large angelfishes, surgeonfishes, and triggerfishes. It can grow up to 12 inches in length and requires a minimum of a 200 gallon aquarium. They are reef safe but may nip at small crustaceans and macro algae.

This fish has a striking appearance, with the juvenile having a dark blue body and iridescent blue spots, while the adult is blackish blue with white edging on all fins. Like most Dasmelfish the Giant damsel is relatively easy to care for and is not a picky eater. Ensure that you provide a habitat with lots of hiding places and good water movement, and offer a meaty diet several times daily, including brine shrimp and various frozen or fresh meaty foods such as mysis, squid, shrimp, clam, and algae such as spirulina and seaweed.