Sleeper Gold-Head Goby (single)

Snapshot: Also known as the Blue Cheek Sleeper Goby. It has a cream body and a yellow head. A sleek, blue streak runs from mouth to gill cover.
 
Other tidbits: Can grow up to 18cm or so. Distributed widely in the Indo-Pacific region, from East Africa to Australia.
 
Bare bones must know: Live-rock fish-only system, fish-only system, or reef aquarium. Sandy substrate for burrowing.