Long story short, I have battled an ammonia problem for two months now. I have a 55 gallon tank which is severely understocked currently (3 small angelfish, 1 medium sized angelfish, 1 dwarf gourami, 4 painted platies and 1 juilli corydora). I feed an extremely small amount once a day. I check my water weekly (more often if I know I have an issue going on) current parameters are pH 8.0, Ammonia .025-.050 PPM, Nitrite 0ppm and Nitrate 5.0ppm. I also do daily water changes, using Prime, of 5-10 gallons depending on the ammonia reading (I was warned against large water changes all at once) After talking with my LFS, and letting them also check my water just to make sure my test kit wasn't wrong, they said that often an ammonia reading pairs with a higher pH level. They suggested that I use Seachem Zeolite in my filters to remove ammonia. My filters are HOB filters. I have two of them on my tank. I first replaced the carbon in just one of the filters with Zeolite, and when the ammonia level didn't drop at all within a day, I replaced the carbon in the second filter. It has been a week since I first added the Zeolite, and the ammonia is still there. I followed the directions on the Zeolite bottle. Has anyone else experienced this, and do you have any suggestions to fix it?