I got some fritz zyme 7 from aquarium co op recently and was wondering if the product gives false testing for ammonia. I originally bought a bottle from amazon but was unsure if it was safe because one of the reviews said that you should test the product for ammonia to make sure it is not spoiled. I tried that, and it tested for 4-8 ppm ammonia. I thought it was spoiled, so I bought another from aquarium co op. I tested that bottle, and got the same results. I contacted fritz zyme and they said it is a false reading because it was not meant to be tested for ammonia, which I thought made sense. So, I used the fritz zyme in one of my betta tanks. I waited a little and when I tested the water the ammonia rose from 1-2 ppm to 4 ppm. I think the product worked though, because right now I am seeing almost no ammonia and some nitrites. But I was wondering if the reading when I first added the product to the tank was false, because I am planning on using it in a quarantine tank and a new tank. I don't want to use it if the ammonia actually was that high because that wouldn't be safe for the new fish.