Im thinking this so far. Quiet one 6000 (1500gph) with 2 1" suctions one in the middle and one on the side. Output will be 2 1" reduced to 3/4" outlets one shooting along the side of the wall and the other at a 45 degree angle closer to the bottom without cutting a groove in the sand. Any inputs or ideas? Waste seems to collect in the middle and some flies around so I figure a side suction would collect that as well.