I was going to attemp to plumb my mag 12 through a bulkhead in my sump but gave up after getting microbubbles in my tank by doing this. Ive seen many people set their pumps up outside and would like to do that to make room in the sump to work around in. I was curious on what is the proper/best way to plumb the pump in order to avoid microbubles. I know that I should put an elbow in the bulkhead so the water would be sucked in under the water line, but i dont know if maybe i just glued the pvc wrong. How do you guys do it? Thanks again for the wealth of information.