I would love to but the overflow just barely fit my 1" durso and the tank was drilled with the return lines inside the overflows on the back wall. The only way I could fit the stand pipes in was under the return lines. If I had the tank designed myself I would have had the returns outside the overflow or made the overflows larger. We're looking at getting a larger house in a year or two and then I'll be setting up a 180g. This is my first tank with overflows so at least I learned what I like and would change next time.

It would be a big pain in the butt now but, could you punch two holes through the back of the tank for the returns and use the existing returns line as the emergency for a "herbie"?

Yeah I should have moved the return lines out side of the over flows. Doing it now means redoing all my plumbing and buy a bunch of new fittings. It's not really loud, from 10 feet away you can't even hear it. I think once the fans from my lights are going I won't hear it all. In retro spect I should have paid the extra $150 and got the tank custom built with herbie ready holes. (It's only 50G)