What filters, fish & décor do you have? Is this your big cichlid tank? I have a little Koralia (400?) that probably isn't big enough for that tank. I also use a Maxi-Jet 1200 that might help you. The real trick is to position the powerhead to actually propel the crud into the filter intakes. Have you played around with filter returns & intake placement? IF you can get those right, you may not need anything else.