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my L.repens have what I think is green (brown? if it exists) spot algae.
My CO2 level is fine, Ph 6.4, Kh 4... I am not sure about Nitrates though, the color I get from the test does not exactly match any of the colors on the chart... I think it is between 5 and 10, but am not sure...

Should I dose more KNO3? At what point do Nitrates become a problem, in case I am overdosing?

I am only dosing about 4 ml Flourish a week, could this be the cause?
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