API Freshwater tests

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16 Feb 2018 15:39 #1 by Paul B (Paul Byrne)
Hi Guys
Just a quick question and observation about API Nitrate test when testing my aquarium water I have noticed the nitrate test looks completely different in natural light than under house light, I was getting a red colour (40ppm) in the room but when in front of the window it was orange (20ppm).

I would assume that daylight would be the true reading of nitrate level.
Is this the case with a lot of test or just API Nitrate test.

Paul B

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