Pixy Hawkfish

Snapshot: Also known as the Coral Hawkfish. It sports a whitish-blue body adorned with bold red spots.
 
Other tidbits: Can grow up to 10cm or so. Range extends from the Red Sea to the Gulf of California and Central America. 
 
Bare bones must know: Live-rock fish-only system, or fish-only system. It is a voracious carnivore!