What kind of turn over are you guys doing on an overstocked chiclid tank. I am doing a 6 times an hour, and it is not cutting the mustard and I am not even "overstocked" yet.
Won't comment on the filtration as you already have some sound advice. How regularly do you do a water change and what quantity? I run a 20% change on a weekly basis. Depending on how the water looks I might do it at 5 days.