From the looks of the see through tentacles it might not be a majano or aipstasia. I forgot the name of it but it's from the same family as ricordias. They are hitch hikers and they usually move to shaded sections of the tank. I do not believe they are detrimental to your tank/corals. I used to target feed those so they'll propagate in my tank. A field of them on a rock is really nice looking.
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