I got ya. Not a bad idea. I could turn the tubs 90 degrees and probably get 2 more up there if I strapped them together. So I could run the mech on the outside and spill into the bio. Interesting... I gotta get that into the model and see how it might work. Thanks man!!!!rottbo;646099; said:I was just gonna say use a sump at the same level for all you mechanical filtration then pump the water over the tank into your bio filtration and scrap the chemical filtration (IMO its to expensive and bio is way better) ... this is exactly how I filter a 750 and 150 off one filter.. its nice i can fit as many as 30 layers of mechanical filtration in my sump then it is easy to change just remove the dirty ones and throw them away its nice.. but of course about once a month i do a complete tear down of the mechanical sump and clean it completely.... and I only use about 40 gallons of bio media on this setup and its clear.. oh yeah I move about 4000 gph since I removed one of the pumps