I have a 90G Glass tank that is drilled for a sump. I do not plan on ever using this tank with a sump. I know I can go get so bulkheads and cap them off, but that will mean that I will have to drill holes in my cabinet to make room for the bulkheads sticking out the bottom of the tank. So, with that being said, could I use square pieces of glass (same thickness as tank) and put them over the holes and seal them? Thanks.