I had a rock that was covered in similar looking zoas that I got rid of months ago because clumps of zoas were breaking off and floating around the tank. Either way I effed it with some Franks.
They were labeled as "Sun Eater" in a mystery box from Tidal Gardens, but there were a few mislabeled corals in that box. I wasn't that upset about things being mislabeled as it was a mystery box anyway. I just assumed they were Pandoras, but I'm not the best judge of such things.