Ok so I lied I didn't have a nitrate test when you asked. With that being said I'd like to say sorry our convo got heated. However i do value someone's advice who Cleary knows their stuff such as yourself so I went out and bought a master kit. im thinkin 10-20ppm is this still ok? I took a picture of the test tube vs the chart but I can't figure out how to post in a PM.