Western Pacific: Yaeyama Islands, Japan to Singapore and the southern Great Barrier Reef; Palau and Truk in Micronesia.
Difficult to sex, females are often more grey in colour than males.
A generally peaceful Goby that will only be territorial to its burrow. A Yellow Watchman will develop a symbiotic relationship with many pistol shrimp. If kept with very boisterous fish it will spend most of its time hidden.