Blue to pale green with no markings. It forms large schools above coral thickets, mostly Acropora.
Unevaluated by the IUCN Red list.
Indo-Pacific: Red sea, East coast of Africa to the Line Islands and Tuamotu Archipelago; north to Ryukyu Islands, south to the Great Barrier Reef and New Caledonia. Adults are found in large aggregations above thickets of branching Acropora corals in sheltered areas such as subtidal reef flats and lagoons. Juveniles closely tied to individual coral heads. They live in a depth range of 1-12 meters.
Breeding is done on sand and rubble. Males prepare nest for spawning which is shared with several females. Large number of eggs spawned hatching in 2-3 days. Males guard the nest ventilating fertilized egg with their caudal fins and feeding on those which do not hatch. Oviparous, distinct pairing during breeding. Eggs are demersal and adhere to the substrate
Up to 10cm.
They feed on phytoplankton.
When startled they will seek shelter among the coral for a while. They should be approached gently.