I had a huge cyano problem recently. I busted out the best YOLO tune I could find and dumped 300G ChemiClean treatment into my sump. Pulled the skimmer cup off and turned the carbon off. Within a day it was all gone and everything was still alive. Once I turned the carbon on and skimmed the Checmiclean out the corals were back with excellent polyp extension and fish were eating as usual.
I'm very picky about my water. The Phosphates and Nitrates were barely detectable, but I still had carpets of this stuff... If it comes back, I'll just Chemiclean the thing again. It was just microbubble fest for a week.
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