i have a 92 all glass, currently im using a overflow box to get the water to the sump, i wanted to drill the side of my thank so that i dont have to use the overflow box, because of having to keep the overflow hose prime, and getting an occasional flood (cleaning it up isnt fun anymore), i was thinking if i drill the side wall i would be ok, but the problem is that i dont know if the side wall is also tempered, has anyone drilled this before? where should it drill it and also if i have the tank at the lfs to drill it, should i have them drill the return and use bulk head also, all opinions will be appreciated. thanks for the help guys