I have a large, drilled, acrylic turtle tank, 8 feet long, 3 feet wide, with 12" of water. That comes out to about 180 gallons of water I believe. I use a wet/dry filter with a sump. Pump is moving 1,200gph total. I have a return and overflow in each back corner. Was thinking of putting both overflows together in one corner and combine both returns into the opposite corner to get more flow in one direction. Appreciate any opinions on this. Thanks.