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I don't know. Where could it have come from? I have reef saver rock so I thought it was free of anything. But I guess it could have come on coral frags?
Thanks for the help. And I guess this goes on the list of stuff I didn't know existed. I did some quick reading and it's pretty amazing how complex these are. I think I'll leave it in the tank for now and see how it develops because some actually look pretty amazing. I just don't know if it will hurt me or anything else