What are people's favorite nitrate test kit and why? I have been using mostly Salifert lately, but the color change is so subtle that it is hard to tell if you have 5 or 25 ppm nitrate. Before that I was using Seachem but noticed that it read consistently much lower. I did some research on that and that is to be expected because the Salifert test doesn't suffer from amine interference. Anyway....what are people's experience?