I just installed the plumbing for my new 120g tank. This took some serious work to get this thing right. I am using a CPR CS120 overflow that splits to a sump and a refugiam. Two Dolphin DP1200 Submersible Pumps bring the water back. The Dolphins work to well and I have the water flow really cut down with gate valves. I still am trying to get the flow down since it has to be balanced between a sump and a refugiam. All in all I am happy, even though I had been planning this thing for several months is took a lot more time and work then I counted on. I took some pictures of the setup, because of the confined space they may be a little hard to make out. I would appreciate comments and questions thanks.