1)Buy a second overflow box
2)Run the second box directly to the sump, bypassing the bioballs
3)Get a pump rated to +/- 900-1,000 gph
4)Buy a skimmer w/proper pump that is rated to app. 250 gal aquarium. I like Berlins
5)Put a powerhead, or two in the tank itself to add another 400-500gph of...