Over time tubing can get dead spots in them in corners and need adjusted. I move mine some just in case every couple of months. I have no clue about bulkheads and can't help you there.
Ok thank you. Only reason I'm asking is because if there is a way to manipulate the tubing to have basically gentle curves as opposed to sharp angles to the sump with PVC, wouldn't that eliminate the risk of dead spots, as well as any loss of flow?