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Nitrate test kit

Anyone got any experience with the Red Sea nitrate test kit?  I originally
got an AP high range test, the first color change is for 20ppm, and I never
measured anything with it, except experimenting in a fishless tank.

I'm now using the Red Sea nitrate.  It's got color changes for 2.5, 5, and
10ppm.   I've been dosing my tank with KNO3, and recent measurements with
both kits found:  0ppm with the AP test, 5-10ppm with the Red Sea test kit.

I'd just like to make sure it's telling the truth.  The plants seem to
indicate that there is now nitrate, as the old leaves aren't melting away
like they were before dosing with KNO3.