I am 2.5 weeks into my 20 gallon Tall's cycle with live plants and pest snails. I recently tested and the nitrites were at 0, I was in disbelief but the test kit doesn't lie. I put in around 2.5 ml of ammonia and waited 24 hours and it was at 0. Then I did the big 80% water change, I let it sit for 24 hrs and tested. The nitrite was way up and nitrates were also up there. The question is, is this because of my live plants, pest snails or even an error from my API master kit? I was very disappointed as I was excited about stocking the tank. Thanks for any help.