Well I was gonna go with my original plan and use the PVC
pipe, but tack the scrubbies across the front of it with silicone. leaving a space at the top for the over flow, for when the scrubbie can't pass water through it. (as a back up) cause the way I wanna do this is go from the UGF
to a power head or 2 to feed this filter. then have it return to the top of the tank.