Sea Hare Hitchhiker?

[mallorieGgator]

Also, I think it is a nudi. It has a smooth underside where as a sea cucumber is the same texture all around the animal. I would take it out and flush it. If it dies in your tank it might release some nasty toxins.

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[Lateral72]

That's definitely nudibranch. From what I understand, it's bad if he dies in your tank. I'd take him out and put him in the ocean.

That is some of the WORST suggestions someone can ever give in this hobby. Setting things "free" in the ocean is VERY bad for the ecosystem. PLEASE NEVER DO THIS, EVER...