The common names for this Angelfish are also – corn sugar, coshubba, rock beasty, and yellow nanny.
The name Rock beauty (Holacanthus tricolor) speaks for itself- it is really Rock Beauty. Unfortunately is not spotted on every dive as they are more Atlantic fish then Caribbean. Their habitat is only on few dive spots in our area around Saona Island.
Rock Beauty lives on rocky reefs and coral reefs at the depth up to 330 ft (100 m).
It is very, very territorial fish; it’s active in day time and sleeping in caverns and holes during the nights. They hardly ever swim more then few feet from their shelters. Juvenile Rock Beauty prefers reefs covered with fire corals which provide more protection, or they hide in shells. Juveniles unlike the other Angelfish do not attend cleaning stations.
The adults live in pair long lasting relations, usually larger and small individual, maybe a sexual dimorphism exists in this species. Due to their high visibility the Rock Beauty is not a numerous species.

Rock Beauty is relatively small, reaching a maximum length of 12 inches (35 cm), but on average 5-8 inches (12-20 cm). Typically for the Angelfish the Rock Beauty body shape is slim compressed discus, small mouth with bands of comb-like teeth. Dorsal, anal and the top of the tail fins grow long filaments as the fish ages.
It is easy to distinguish Rock Beauty from other Angelfish species by the black and yellow color. You can describe the coloration either like brilliant yellow fish with black body or more accurate description is that the head and tail are bright yellow, and this yellow color forms a rim around the black body. The lips are black sometimes navy blue.

There is no difference in colors between juveniles and adults except the pattern. The young fish are completely yellow with small black spot and blue border ring below dorsal fin. The black spot gradually spreads through the body and the blue ring completely disappears as the fish reach adult size.
Rock beauty feed primarily on sponges, occasionally on corals, tunicates, and algae.