I've been considering plumbing my Ecoxotic Pico to my basement. Just curious, did you use 1" bulkheads? I was thinking about using 1/2" since the volume of water I need to move is so small. With sand and live rock in the display I only have a little over 3 gallons of water in the display. Was there a reason you created an overflow in the back of the tank instead of just drilling two bulkheads toward the top of the tank, using one as a return and the other as the overflow? This would mean drilling the rear glass, not the bottom. I was going to creat a mini surface skimming overflow by using a 90 degree black 1/2" elbow and cutting small teeth in a piece of 1/2 inch black pvc turned up toward the surface of the water so I can cut it to set the water level in the display as I like. Any thoughts on that idea. I thought if I kept the flow rate reasonable, I could avoid noise coming from the overflow.