Amquel and Ammo-Lock will both give false readings in only Nessler based test kits, meaning if your ammonia test kit only contains one bottle. If your test kit contains 2 bottles it is not a false reading but your actual ammonia reading, just in a detoxed state. This will be gone once your filter's nitrifying bacteria catches up.i have used AmQuel in my tank before. Has anyone else here ever used it? If so, what did you think about it?