Author: (Smith, 1966)
FBname: Slender unicorn
Comments: Inhabits coastal to outer reef slopes, usually swimming along upper edges of drop-offs in small schools (Ref. 48637).  Descends from the water column to the reef front to be cleaned by <i>Labroides dimidiatus</i> (Ref. 4974).  Feeds on benthic algae (Ref. 3145).  Forms aggregations, feeding on zooplankton well above the bottom over or in the immediate vicinity of reefs.  Males exhibit rapid and striking changes in color pattern during courtship (Ref. 10671).