Male with especially prolonged second dorsal spine; mostly yellow in upper half of body, lavender pink below, and yellow caudal fin with magenta upper and lower margins. Female similar with broader yellow zone around dorsal. A common import but expensive due to its remote collection limited to the Marshall Islands.
Each male dominates a group of females and enforces a pecking-order hierarchy. In the event the male is gone, the most dominant female will turn male and assumes the dominant male’s role in the harem. This is very interesting to observer in captivity if the aquarium is large enough. However if confined to a small space the weaker individuals can get harassed into hiding, refusing to eat and wasting away.