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Fw: Of Algae and Diatom Filters, was orthophosphate


 Which Red Sea nitrate kit are you using? They have one with a powdered
 reagent and one that just uses liquid drops. The powder reagent test is
 purportedly more accurate, but their instructions say to use the other test
 for ranges that are above 10ppm. This may give you a better idea if you
 can't distinguish between the pink/red tones.