This is weird... I've been medicating my tank with coppersafe and doing 30-40% WC daily for the past three days. Fish are looking better but I just tested the perameters last night and found a very suprising result of over 1.0 ppm ammonia!! The funny thing is that nitrite - 0 and nitrate - 5<!! Huh? Today I tested and againg the ammonia is a little over 1!! Could the coppersafe be effecting my ammonia readings? My fish are acting normally - and if anything, better then before adding the medication. This is an established tank and even in the beginning I don't recall the ammonia ever getting that high. How is this poss. after a 40% WC just last night? I'm using a liquid/beaker test, not strips. It's almost like the test is somehow flawed.....