It's a dorid nudibranch and like all other dorids a sponge feeders. These generally have very restricted diets which may consist of a group of related sponges or maybe even just one particular sponge. No doubt it's crawling about in search of food.
Are pictures of this guy really so rare? If so I can take lots of pics. I see him all the time at night. He might not live long though as I do not have an awful lot of sponge.
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