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Since then my xenia has started to shrivel. May be coincidence but I've never seen these before. There are two of them on the same rock. My xenia have been super healthy and multiplying for about six months until now.
Its kinda hard to see, but compare it to pics of a palythoa. They have toxins and are semi-agressive. Not many good pics of the green ones like yours may be (and that I have).