It's been a little over 2 months now and the ammonia still tests sky high in my 55 gallon tank. I am thoroughly disgusted with Amquel at this point, and wouldn't recommend it to anybody to use anywhere within a 300 mile radius of fish. I suspect it could be a good paint thinner or insect repellent though. It obviously sticks around FAR, far longer than they claim it does, since I only used one dose 8 weeks ago, and am STILL getting false positive ammonia readings. Is my test kit bad? No, it's not. I have 3 other tanks and I get 0 ammonia readings in those. The fish are all fine in those tanks, just as they are in the 55 I'm writing about now. Have I done water changes, and if so, how frequently? I've done 2 in the last month. My tapwater has ammonia in it, so water changes don't fill me with alot of confidence when it comes to high ammonia issues. I cleaned the gravel during both changes. I also cleaned all the filter pads in both filters (With water from the tank, not tap) The fish are showing no signs of stress at all, but it drives me nuts to constantly see that high ammonia reading. It's impossible to know what's really going on there. The nitrites are 0, the nitrates 10 ppm. This tank has been established about a year now. I'm fully aware of the nitrogen cycle and know this tank has gone through it. Anyway, the main reason for this post was to bash Amquel, and I lost sight of that briefly.For that I apologize. To all out there interested in keeping their fish healthy- AVOID AMQUEL LIKE YOU WOULD POURING BORIC ACID INTO YOUR TANK. It stinks, literally,and although it might temporarily render the ammonia harmless, it stays in your tank eternally. It's a nasty, nasty chemical, and should be outlawed by anyone that gives so much as one iota about sentient creatures. Go with Prime if it's an emergency!!!!