Hey Ben Thanks for chiming in.
The sand could be a problem but it's really only an inch deep. Hardly a nitrate factory. Plus I have very little Algae and very low Nitrates. but I gues it could be hiding something we do not measure.
As for test kits. I have 3 sets of Salifert and Elos. I have also taken water to OA. All readings are the same.
J
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