So heres the plan. I have a standard dual overflow aqueon 120 that is going in my living room and I dont want a competition between the tv and tank to see which is louder. Instead of using the megaflow kits that come with it I am going to turn the left overflow holes into a full siphon and dry emergency drain. The right overflow will be a wet drain and return line, wet drain will be in this overflow so it still surface skims. These are all 1" holes. To get the overflow boxes to work as one I am gonna drill holes for 1/2" bulkheads into each overflow opposite of eachother and connect via black 1/2" sch 40 pvc, later on I'll use this as a support for a frag rack or to place shelf rock and corals on between the overflows. I could place the pipe under the sand but prefer using it in this way instead. Waiting on plumbing parts to arrive so will post pics as the build progresses, should have everything by monday though to start.