Parrotfish's teeth are fused to strong plates with which they can scrape polyps and algae of the surface of hard corals. They also ingest some of the corals limestone skeleton which they release in clouds of fine white sand.Parrotfish are swimming around all day, but at night they find a crevice on the reef and go into sleep mode. In order to not disturb the sleeping fish I used a red light torch to help the camera focus. The photo is taken with an underwater flash and a macro lens.