I have struggled with a persistent presence of cyano in my tank for several years. I tried to treat it with several common commercial products for treating cyano that never worked. I had written it off an accepted it as an inevitable fixture in my system. Then recently i treated the whole tank with cipro (500 g per night, 400 gallon total volume for a week) because I had a couple of torches randomly melt over the winter and I was concerned there may be a bacterial pathogen.
After treating for a week I performed a water change, turned on UV, and dosed PNS to reinoculate the system with bacteria. Then a week later, not a spot of cycno can be found anywhere in my system. It seems like I accidentally stumbled upon a cure for my stubborn cyano! I see patches of my sand bed I have not seen in years now. I figured I would share!
