I am aquiring a 220 gal this weekend. I am going to have it drilled for overflows. I want to use the all-glass mega flow overflow kit because it sucks from 3 levels not just the surface. The problem is the bottom is tempered and un drillable. Does anyone see a problem with drilling the back down as low as i can and still using that overflow kit? I will just come out the back and 90 down.
