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the "feathery" extensions you speak of are likely cerata and indicate that your slug is a predatory Opisthobranch. It may eat coral, sponge, bryozoans, etc.
Tritoniopsis is a common variety (pic in my "Reef Invertebrates" book, Julian's "Reef Aquarium", etc)
This critter eats soft corals.
Do browse the website seaslugforum for pics and IDs to help here.
best regards, Anthony
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