I don’t have a meter but I remember someone else got a reading of 1-2. In all honesty, I believe any cyano/algae in my tanks have been related to flow & skimmer issues and I’ve experienced nothing more than a little patch here and there. I still need to work out my powerhead positioning but it’s tricky due to the sand & my rock placement. I believe the most important element in my tank is the live rock - which came from a very mature tank.
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 Maggie
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