Dark grey to brown with a white tail and tail base, rear dorsal and anal fins are whitish or clear and a blue spot covering the pectoral fin base. They live solitary or in small groups.
Unassessed by the IUCN Red list.
They can be found in Indonesia and the Philippines to the Line Islands in the Eastern Pacific, in a depth range of 20-50 meters.
Oviparous, distinct pairing during breeding. Eggs are laid on the bottom and stick to the substrate, the males guard and aerate the eggs.
Up to 9cm.
They feed on zooplankton and algae.