Dave,
The next changes have been to widen the slot so there is less back pressure to the pump, attach a plexi tube to the lid to shield the bulb and rotate the T's down 90 degrees so that its not attached to the lid.
Next I'm going to run half of the new one I'm going to build on the water coming from out of the tank and the other sides from a pump in the sump and see what the difference will be.