platapus - I used a 1 3/4" drill bit for the 1" bulkhead.
lovetoreef - I love the closed loop and especially the holes drilled in the bottom. There is so much more current in this tank than I ever had before. The nice thing about the holes drilled in the bottom is that I can get current flowing back towards the aquascaping, not just coming from the back, and with the adjustable loc-line fittings, I can change the flow pattern very easily.
As for the ReefBones, yes, it is just basically base rock, but very nice shapes and sizes.