Habitat: Marine; inhabit shallow reefs, and deeper patch reefs. Distribution: Cristobal, Solarte and Bastimentos Islands, Crawl Key and Wild Cane Key N of Bastimentos Island, Punta Caracol Patch reefs Natural History Notes: Egg guarding males are aggressively territorial but guard only small areas. Feeds mainly on algae but also on polychaetes, hydroids, copepods and ascidians. Depth: 0 - 100m Characteristics: Body surface dark at the anterior of the fish then abruptly pales towards the posterior, often to a shade of yellow between the last dorsal spine and the anal fin origin. Pale fins can be blue. The colour phase described can be reversed on rare occasions. Length 2 - 3.5in, max. 4in.