I have a 55 gallon tank with a 9 inch oscar in it. I have two AquaClear 70 filters and a Rena Filstar XP3. I have had a problem with my ammonia for over a month now being at around 3.0. Here is my water quality currently: Ammonia: 3.0 Nitrite .25 Ph: 6.0 Nitrate: 0 Nitrate: 0 I understand that that the low Ph will turn my Ammonia into something else that is not has harmful to the fish and that's the reason why my cycle is not complete. The fish has been in the tank for a little over a year now. I do a weekly water change of 10% and use Prime each time. I have tried not feeding for a week, going two weeks between water changes you name it I have tried it. So is there anyway to complete my cycle? I cannot find a way to get everything back to normal.