For some reason all of my zoa's were all closed up for about a month, none of them seemed to be melting or anything and they didn't seem to have fungus or anything. I did dose Vit. C for about a month and within the 1st couple days they started opening slowly and by the end of the 1st week they were all open and happy, I dosed for the rest of the month and have since stopped as they are all open and looking fantastic. I got the powdered buffered vitamin C from a local health supermarket, it was about $15 and dosed about 1 tbsp 2X per day in a 46 gallon tank.
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