Sea Slug? ID Please

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Frigideus

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Normal 4 am tank watching, doing a little scrubbing to fight off the uglies. Noticed this thing. I can't find anything that looks like it on the web. Pretty plain looking and also decently big. About 1 inch long.

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I hope I don't need to get rid of it since it's full of personality but please tell me if it's safe to keep around or not!
 
Top Shelf Aquatics
Nudibranch of some sort. Not sure the exact type
 

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