I have lost one Zoa frag that developed something that I can only describe as a white fiber mesh substance that i tried to remove. The Zoas started shrinking and closing and I tossed the frag as i hoped to nip this but now it is on a second frag - again Zoas. I see no parasites, but it clearly is bad stuff. Have not been able to find anything about how to deal with this. Any help appreciated.