How often should you test for calcium, magnesium and kh (alkalinity)?

Joe.D

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I was testing those 3 weekly to compare to my Trident.

After reading posts here from Randy Holmes Farley where he says Ca moves slowly and recommends not even testing Mg I have decided to only test those three when I change to new Trident reagents. For what I paid for the Trident, I may as well trust it. So far, so good.

I test Nitrate and Phosphate weekly.
 
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