I plan on adding more chiclids to my 125g. I have 20 or so now and would like 15-20 more. I am running flaval404 canister and a wet/dry (w/mag 5 pump) and a big powerhead with filter (total at least 650 g/h turn over). Even with all this mechanical filtration and weekly water changes, I am fighting with particals floating around, more now, than when I had fewer fishes (and less filtration). Which leads me to the question: How much filtration does one need for a heavy loaded tank? How do you guys do it?