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My first thought would be a Tritoniid nudibranch of some kind - any chance you could get clear pics of the top and the side (like in your pic above) with brighter, white light?
Looks like a Tritoniid (taxonomic family Tritoniidae) nudibranch of some kind - you'd need clearer, closer up pics under white light for a solid ID. That said, it most likely eats either soft corals/gorgonians, or hydroids.