eco23
Aquarium Advice Addict
I'm gonna make an assumption here and say that something is up with your test kit. I believe you when you say you're testing it right (you're also letting it sit for 5 mins, right?), but some of these numbers don't make sense. I totally buy the nitrAte content from the gravel explanation, but then for them to rocket back up...then just disappear even faster is a borderline impossibility in my mind. Do you have a lfs nearby that can double check your results for you?