I have yet to add any live stock to my tank and I am wondering if I should redo my plumbing. My current overflow box only has 1 drain and that is starting to scare me, I can get a new one that has 2. I couldn't drill my back glass unfortunately so I'm stuck with overflow boxes. The first image is basically (not to scale) what I have now, the second image is what I was thinking of changing it to. Any suggestions would be greatly appreciated.