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Melichthys niger
A lovely school of triggerfish, also known as Humuhumu'ele'ele (Hawaiian) or black durgon. It appears black when underwater but is actually blue or purple with a pink undertone and teal accents.
Maalaea Bay, in the Pacific Ocean off the western coast of Maui.
Some have a prominent turquoise stripe on the dorsal fin or the tail.
Your ID is right on the money, from what I can tell. Thanks again, SargonR.
Hard to tell, but based on the black body and white lines where the fins meet the body I would guess Black Triggerfish.