Occurs in shallow outer reefs subject to surge (Ref. 9770). Commonly found over barren rock or the spur-and-groove zone where there is a mixture of bare rock, rubble, and coral. Feeds on algae, detritus, molluscs, crustaceans, worms, echinoderms, fishes, sponges, foraminiferans, and eggs. Territorial. Also taken by drive-in nets (Ref. 9770).