Ammonia/Nitrate/Nitrite Poisoning in 55 Gallon HELP PLEASE!!?

Ok, so in the last few days I've been asking a LOT of questions on yahoo answers, so sorry if you've already answered any of my questions. Anyway, I really need some advice. K here's the deal: I set up a 55 gallon african cichlid tank a while ago, and they got ammonia poisoning. I began treating them for it by lowering the pH, doing daily water changes and using products like "Tank Buddies". I also bought a pH/ammonia live tester, but i think the ammonia part is broken because it hasnt changed color since it's been in there. At any rate, I got a filter from an established tank and out it in mine to help speed up the whole bacterial growth of the nitrogen cycle. It made the water extremely cloudy and definitely added to the ammonia levels, so i did a 20% water change which the fish responded extremely well to. Anyway, last night I'm coming up to bed ant it's like 12:15 -HAPPY NEW YEAR BY THE WAY!- and I see all the fish, even the synodontis catfish gasping for air. Someone told me to stop doing water changes because it will delay the cycle and ammonia and nitrate levels need to peak then they'll go down, so I just went to bed. This morning I wake up and all the fish are just magically better, swimming around and having the time of their little lives! On the down side, the water is really cloudy and gross. I looked closely and their gills don't seem to be irritated. Should I do another water change? If so how much? I think I should because daily water changes help lower the levels of nitrate,nitrite and ammonia but what do you guys think? Any suggestions are welcome :)