The name: The surgeonfish has a number of common names such as blue tang, blue hippo tang or palette surgeonfish. The latter derives from the markings of the fish which look like an artist's palette.
Food: Surgeonfish have sharp teeth on the outside of their lips with which they scrape algae from corals and stones for food.
Good defenders, but...: Surgeonfish can defend themselves well, but are very jumpy. Therefore they look for a safe place to sleep at night.