i made my own filter and all,, heres how it works
intake is the 3" pvc U thats turned upsied down into the 29 gallon that has light diffuser panles to make media chambers then there is an 1100 gallon an hour pump that pumps water into the drain plug then the water goes into an 8" deep area under a huge undergravel filter (yes 8" of water beneath the gravel so the gravel is only 1 1/2" deep) this works awesome i have had to add powerheads to create surface aggitation