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Glad I found this thread and that I'm not the only one who this is happening to. I've always found Zoas to be about as carefree and easy as a "coral" can be, but in the past month I have had three colonies do the "withering" thing. The polyps get umbrella shaped and small then the stems get skinny and eventually dissolve away. I see no nudis and have no cheesy film stuff. The affected ones sit right next to others that show no symptoms. All have been in my tank for no less than 4 months. Very strange. Wish I knew what the hell was going on....
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