If it is Byprosis you can treat the individual frags with a mixture of 50/50 tank water and hydrogren peroxide. I had this only on a few Zoas i picked up and treated it this way. After two treatments there is no more byprosis and they have began growing again.
I dipped them for 3-5 mins then rinsed them off really well and then returned them to my tank. While being dipped I swished them back and forth to get rid of any loose Byprosis.
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