I did a nitrate test the other day in my planted tank and it read 0. I added some ferts and tested later....still 0. I just made a new fert solution of 1 teaspoon of KNO3 in 110 ml of water, which I then added 2 ml to a 2 liter of water. I tested it and it read 0. ARRRGH! This is the 2nd nitrate test kit that doesnt do what its supposed to.
My plants look bleak as I dont know if my solution is crap or the test kit is. Nice.
I searched around on the web and found some API nitrate instructions. Seems you have to shake the 2nd bottle hard for 30 sec, and then add drops, and then shake the tube hard for a minute. I never saw that in my instruction booklet- and I read it ....twice:butt: