True 
Ken just stopped by to talk about some of the tank work we need to do. His back is giving him trouble, so we're going to shoot for a work day on Monday since I'm off.
He's going to cut the two lengths of ABS 2" pipe for the skimmer. The skimmer bulkheads are going to be centered on the inner half of the cutout.
We decided to place two bulkheads on each side at the bottom. Each centered on half the cutout. This places them 6" off the bottom and should prevent substrate from getting in them and still pull debris off the bottom quite well.

Ken just stopped by to talk about some of the tank work we need to do. His back is giving him trouble, so we're going to shoot for a work day on Monday since I'm off.
He's going to cut the two lengths of ABS 2" pipe for the skimmer. The skimmer bulkheads are going to be centered on the inner half of the cutout.
We decided to place two bulkheads on each side at the bottom. Each centered on half the cutout. This places them 6" off the bottom and should prevent substrate from getting in them and still pull debris off the bottom quite well.