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For me it was not so much how many as what kind. Fast growing plants definitely rather than medium or slow growing. For me even one plant of vallisneria contortionist sucks the nitrates out of my tank in like a week. But then if I don't fertilize to raise the nitrates back up it starts to die and I get cyanobacteria.
 

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I have trouble with cyanobacteria when nitrates are zero in my planted tanks. When that happens, I need to add nitrates back IN.

About 10ppm is the lowest I want to go in a planted tank.
 
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