I had a cyano problem for the last 3 months. I tried chemi-clean but it all came back after a couple weeks. I was told by a LFS to raise my Magnesium levels by dosing with Kent Tech M Magnesium supplement. I was skeptical but most all my cyano was gone within a week. Worked for me and worth a try. There is a thread on RC about high magnesium levels snuffing out nuisance algae. Just my 2 cents.
Your Cyano problem could also be related to high phosphates.
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