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I recently raised my Phosphates and nitrates to appropriate levels but not potassium.Can i raise it with K2SO4?I guess I should estimate the concentration but it would help if anyone could give me a ratio of K:NO3 or K:pO4.I also don,t know if I'm done with the macronutrients,should I also use magnesium?
 

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I've always targetted a level of K=20, and I've been been changing my NO3 and PO4 levels over time, so I dont' have a ratio :wink: . Since I don't have a K test kit, I assume the level is close to 0 and just add 15-20ppm on a water change. As was suggested above, I first add KNO3 and then use K2SO4 to dose the rest.
 

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Oh, and magnesium is to raise one of the hardness values (can't recall if it is KH or GH). Since my tap water is kh=7, gh=10+, I don't bother with magnesium supplementation in my tank.
 
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