I'm wanting to make a DIY pond filter with my Marineland 550 Powerhead. The problem is, it only pumps 145 GPH. I'm planning for it to pump water through a 1 gallon container with alternating layers of gravel and sponge. Is there any way I can increase the GPH it puts out? I have one of those air pumps; is there any way I can use that to increase the water flow? How big of a pond could I filter with the 145 GPH powerhead pumping water through a 1-gallon filter media container? Should I get a bigger container?