It's an Elysia species for sure, one of the solar-powered sacoglossans. It won't hurt anything in your tank, but the other animals may kill it. You can scroll through the species of Elysia here:
Well, I'm certainly no sacoglossan expert, and if it's from anywhere other than the Indo-Pacific, I wouldn't have a chance of recognizing it, but...it's fairly similar to one of the slugs I collected in Samoa. Bill Rudman believes it is a variation of Elysia rufescens:
Yours has a few obvious, if not glaring, differences, including what appears to be a white border on the parapodia. It still might be a variation of this species, though.
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