Can the majority of flow through the floor of the tank get the job done? I'm very seriously considering 3, 1 1/2" cl setups for my 320g 360 view tank (64" x 24" x 17" x 40" FBX... 36"s tall, bent edges. Centered 9" x 9" square overflow with 2, 1" drains, 2, 3/4" returns, and 1, 2" dry bay...