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Fed the tank last night and everything looked great. Got up this morning and overnight my red dragon colony and frag had COMPLETELY RTN'd. It was in the same spot as a rainbow Millie I had that did the same thing. I'm just so bummed that was the fastest growing coral by far in my tank. In that spot my return can blow on it so maybe the dosing in the sump blowing in the general area has something to do with it. I did adjust my lighting intensity up some last week but I doubt that's what caused it. The other factor was taking GFO and carbon offline trying to get PO4 up just a little. I don't have a frag tank so I lost all my red dragon. I just wished I knew for sure what caused it. :doh: