Helfrichi Firefish (Eating Pellets)

Snapshot: This stunner has a vibrant yellow head, a purple forehead, and a body that flaunts a funky mix of purple and white hues.
 
Other tidbits: Can grow up to 6cm or so. Distributed throughout the Pacific Ocean.
 
Bare bones must know: Live-rock fish-only system, fish-only system, or reef aquarium.