So after reading some dismal reviews of the accuracy of the API nitrate test kit, I ordered a Red Sea kit and tested for nitrates in my mixed reef.
Red Sea came back with 20 ppm. I thought the API came back with 5 ppm, but if you look lengthwise down the API test tube, it read 20 ppm as well because the color appears more developed. I know my API copper says to look down the length of the vial to take the reading, but the nitrate test kit instructions do not say to do this. Is it possible that I've just been reading the API wrong all these years?
Red Sea came back with 20 ppm. I thought the API came back with 5 ppm, but if you look lengthwise down the API test tube, it read 20 ppm as well because the color appears more developed. I know my API copper says to look down the length of the vial to take the reading, but the nitrate test kit instructions do not say to do this. Is it possible that I've just been reading the API wrong all these years?