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I am not finding much information about the sessile sea cucumber online. Is it safe to stay in my tank, or do I need to remove that rock and find a way to get rid of him?

Thank you! I did see it pull its arms into its mouth over and over again... I have never encountered aiptasia before though, so I was unsure of its demeanor.

Can someone please help me identify the critter in the circle below. Please, please tell me it's not aiptasia...