The Planted Tank Forum - View Single Post - not enough co2 or too much light or ferts unbalanced?
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post #3 of (permalink) Old 03-26-2015, 08:51 PM
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I have the same crud on older leaves of my plants too (thread in past 24hr for pics).
With your KH of 9, a pH 1.3 drop should be heaps of CO2.
What is your PO4 level?
I am suspecting my algae problem got out of hand when I ran my NO3/PO4 much higher than I now do (around 40/8ppm), whereas now, the problem isn't as bad with numbers around 10/2ppm.
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