Are you using ro/di water? How heavily stocked is your tank? Skimmer running ok?
I was/am battling hair algae and cyano. I have been doing 50 gallon water changes ever two weeks on a 120gal + sump system. I am winning the battle. Using ro/di water. carbon change with water change. Running GFO and zeovit system. Algae is dying off. Doing as much manual removal as I can. I run my lights about 11 hrs /day 2 250 watt Mh and t5 for color.
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