Good photo! That's a special little nudibranch called Vayssierea felis which is a obligate predator on spirorbid tube worms. It's common throughout the Indo-Pacific and probably has a caribbean counterpart. You can read more about it at http://seaslugforum.net/vaysfeli.htm
This is only the second time I've seen them here. People are always asking how to get rid of spirorbids, and these slugs are so attractive (I think.) I'm glad you like them!
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