Well the drain line comes threw the floor and it splits with shutoffs , one to the ruge and the other to the sump . I have it set now that all the water is running into the ruge. The ruge is split one side rock and the other I have more rock and fish. From there two lines a 1" and a 3/4" run down into the sump where that is split, protein skimmer area,bubble trap, more rock and cheato area, then the return area where I have the phosban reactor with GFO and another reactor running carbon. Then it runs back up to the tank.I also set up the fuge to be able to be isolated from the main tank, I drilled a hole on the bottom right side of the tank so I can hook up a small pump to bring it back around to the front of the tank and there is a cutoff on the return line of the main tank. plus that hole works well for draining .water on water changes.