i am having quite a problem with my ammonia right now and need some help. i have been reading for 3 days now on how to rid my tank of the ammonia it has and feel as though im more hopeless now than in the beginning.... My tank is cycled, been running for bout 2 1/2 months now with fish and my ammonia is reading 4-5 ppm, nitrite 0 nitrate 0. I did a 50 % water change yesterday and the day before after i lost 3 tiger barbs and it still reads 4 ppm. I had added ammo lock a few days ago but when it did nothing i started to focus on water changes. But no matter how much i search i cannot find anything or anyone with this problem. My water was dirty before the changes and has gotten clearer, and i reduced the amount of water in the tank to get more o2 in the water. I also cut back a bit on the feeding bout 50%. I need some serious help here before i lost my precious cats!!! should i possibly keep the water changes going, maybe buy a new filter? i cleaned the filter a few times in tank water bet is it time for a new one? argh.... what should i do??