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BiologyA solitary species (Ref. 26340) found on nearly vertical cliffs and drop-offs beyond outer reefs. Often upside-down. Retreats into recesses when alarmed (Ref. 9710). Has been reared in captivity (Ref. 35420). Most common in water more than 30 m deep. Gradually replaces G. loreto at depths of 15-30 m (Ref. 26938).