I own an aquarium tank made by All Glass Aquarium, and i'm not sure if you guys are aware of this, but all around the top of the tank there is that black molding they put onto the tank. Now i'm planning on setting up a sump and for that to work, I believe you need an overflow correct? Well my dilemma is how can I get an overflow working without having to do any drilling to the bottom or back of the tank. I have seen Marine Depot carry some overflow boxes and I can see a gap on those boxes that would be able to place over the top rear of the tank but i'm not sure if the gap is wide enough to fit that black molding that's on top of my tank. Well any advice or any ideas would be of great help. Thank you very much.