I had a thread on tank drilling before and after all reading i've done I just won't one more final opinion from everyone before I make my purchases. I finished up construction on my tank stand last weekend just needs to be finished.(Will for sure post pics when completed):D I'm building my canopy this weekend so I'm ready to get things rolling. My tank is a 55g with 20g sump. With the info i've gathered up I'm think'n a mag7 will be perfect for pump. For drain from display to sump i'm thinking either a 1' or 1 1/2'. The drain i'm going to drill tank for so I'm getting ready to order bulkhead for whatever size recommended and whole saw bit. The return line I have no idea what size to go. I keep reading that the return line should be smaller than the drain. Should I drill return also or take it over the back of the tank like I see in right many tank shots?? Thanks much in advance for all the help...