Marine Betta (Eating Pellets )

Snapshot: Also referred to as the Comet. These eel-like beauties sport a dark black body, adorned with white spots. Their tail fin features a striking blue and orange spot.
 
Other tidbits: Can grow up to 20cm or so. Native to the Indian and Pacific Oceans, they can be found from East Africa to the central-Pacific, south of Hawaii.
 
Bare bones must know: Live-rock fish only system, or reef aquarium with plenty of live rock. A nocturnal creature that's more active at night.