Your parameters look good because the algae is consuming it and your test results (hope you invested in quality test gear) are only telling you what is left on the plate so to speak. I have also had great success using the center chamber to grow hair algae. Cheato turned out to be a problem keeping it totoally contained within the chamber. Step up your eater changes and reduce into of pollutants. Good luck
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Jimbo
13.5G EVO
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