Clown triggerfish  

(Balistoides conspicillum)

The Clown Triggerfish is one of the most desirable fish for aquariums because of its unique appearance. These fish have large white spots on their black bellies and small black spots on their yellow backs. They are also recognizable by a thick, white band under the eye and bright, orange-yellow lips. Their sharp teeth help in consuming a  diet  of shelled animals.

Clown Triggerfish are normally shy and solitary, but they can be very aggressive. Some may charge or attack intruders. When hiding from predators, triggerfish lock themselves into small openings with their trigger fin and bite down on the coral or rock to ensure their safety.

These fish can be found in clear, coastal waters and around coral reefs as deep as 75 meters

Pic from http://www.aquariumdomain.com/

Info from http://aqua.org/