I'm rolling a 9.5 now, but when you figure in the 5' of head loss and a couple of gentle bends, it really only is pushing about 600-700 gph.
Was thinking of replacing the 9.5 on the 180 with something bigger, then using the 9.5 to push water for a combined sump setup for some of the bigger breeder tanks in the fish room.
Anyone have any experience with "Quiet One" pumps?