The thing to say to ur ammonia: "Down boy, Down!!" Way too high. Ammonia should be zero. Nitrites are a lil high too (or is it the nitrates, oh well). 50% water changes every day. Stop the Ammo-Lock (I learned the hard way) and get a gravel vac. Clean the gravel to get any bacteria out of the gravel. Keep on top of the water changes. If your ammonia was 8.0 AFTER a 50% water change, then it must have been much higher, causing your problems. Check your fish daily, and do regular water changes.