does anyone have advice on drilling a 75 gallon all glass aquarium. it looks like this would be the way to go for me, as i have been researching sumps and would like to try one with my aquarium. i can't really afford a hang on overflow. i was also wondering if you can drill an aquariumabout 1" from the bottom and use 90 degree elbows for the inlet and outlet of your sump. i want to do this because my aquarium has a tempered glass bottom. thanks for the advice.