So here is the real brains of the whole operation and I could just KISS GH for thinking this up. It's a pumping column set up inside the rez that pulls the air in from the intake valve you set up and into the general rez.

We made one by adding an inch of 1/2 in tubing and an L extension to the bottom of the pumping column.....then cut the larger white tube down to approximately six inches (high enough to be above water level but low enough to stay inside the bucket) but we left the airline completely intact.

The third photo is a close up of both the one we made and the one that came with the GH kit.