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The adult rock beauty is mostly yellow, turning blue toward the tail. The tail itself is yellow. The pectoral fins and ventral fins are yellow, and the lips and the edges of their dorsal fins and anal fins are dark blue. The adult measures up to 10 inches (25 cm).
The rock beauty feeds primarily on sponges. It may also eat tunicates, jellyfish, and corals, as well as plankton and algae. Seen in most dive sites throughout Bonaire.