Red Lionfish (a venomous coral reef fish native to Indo-Pacific region) by Bruce Bugbee. Due to the incredible amount of success that Lionfish have while hunting, certain biologists have joked about nicknaming them "terminator fish"
One of my favourite fish, ever! Achilles Tang/Achilles surgeonfish (Acanthurus achilles) found on reefs of Oceania Hawaii/Pitcairn slightly less in Mariana Islands and sometimes reefs in southern Mexico and Guatemala
There are many kinds of Triggerfish. This is a Clown Triggerfish. They are very feisty and will bite your hand when trying to feed them. If you keep them in an aquarium they will bite tubes and stuff and cause real havoc! They have personality.