Dosing vinegar with a big skimmer for export and a uv light has worked awesome for me. My tank is 300gal, and was started November 2014. I had the same issues you describe and also had a fair bit of hair algae and a really cloudy bacterial bloom too. It was so bad at one point I could suck out the cyano and within about 10 minutes it would be back. I have been dosing 30ml vinegar daily since I started the tank and in the last few weeks the that has become completely clear of algae. Reefwars posted a vinegar dosing regimen. I have been sticking to .1 ml per gallon vinegar and am now slowly increasing the vinegar to 40ml per day. Nitrate and phosphate are 0.
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