Has anyone ever had thier zoas fade away in color til almost becoming transparent? Not like light fading which occurs gradually. The zoa colony lost almost all its color in approx. 2-3 days. Now i'm noticing some of my other frags in the tank are starting to do the same thing. I'm really getting worried. I dipped the first colony with saltwater/lugals, and placed in my qt. Most of the polyps are open, and there doesn't appear to be fungus growing. The only change that has been made to the tank is i've switch to Randy Holmes Farley's recipe for alk/cal. Interestingly this has happened to me about 1-2 yrs agoin a mantis spieces tank. I had 10 or so zoa frags all appeared healthy, water perameters were good. One day i noticed one frag was a little faded. A day or two later it was all withered up, and the others started to fade as well. Needless to say i lost all but 1 frag. I hoping to prevent any losses this time, so any help would be appreciated.