Hello,
I just saw this "mystery slug" today in my coral tank.
Because of it's antennae and yellow lining around the white on the bottom, I suspect some kind of Nudibranch.
(its front is to the left)
Arminid nudibranch, soft coral eater. You can scroll through the arminids on seaslugforum.net if you want a species level ID, although there are a lot of the arminids that either don't have names or aren't included there.
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