Hello, My tank has finally cycled and is successfully converting 2ppm ammonia to 0 ammonia and nitrites in 24hrs. I just did a 40% water change with my tap water that had 0 nitrite or ammonia and added some prime. I then tested the water and it says I have 0.25 ppm ammonia and nirite. Is it possible that prime is causing false positive readings? The tap water was testing at 0ppm before I added it.