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I wonder if you went too fast, I let my cyano go for about 4 weeks before I chemicleaned it, I controlled it by sucking it up with a baster when it was getting too heavy. I also let the green micro algae grow on the glass until I could barely see through it, about 3 or 4 days. I turned my skimmer on when hair algae was starting to grow on the back glass, scraped it off with a scraper.
I maintained my no3 @ 3ppm (sulphur denitrator) and po4 @ .03 (lanthanum chloride)
I sample my socks every change under the scope and can't find dinos, I also let the bucket stand for awhile when I vacuum the sand and sample it at the bottom, middle and top and nothing.
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