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Thanks for the quick reply. So they're bad The info on these is all over the place on how to get rid of them. I think they are only on the one rock. If I took it out and bleached the rock would that kill them?
Thanks @mr_x for your advice. They've been plucked, scrubbed and I even put some aiptasia x on just in case. Now it's a waiting game to see if they come back or pop out somewhere else.