welcome to the site, I think you are going to have a very very hard time finding a glass company that will drill a tank because of the tempered glass issue.let me tell ya a little story, so I'm going to build my first sump right, get on CL and find a 30 gal tank, go to his house drain it,load it, next day go to home depo by acrilic cut baffels and install. next day take it to my LFS to have the SIDE not bottom drilled and watched it explode the minute the bit touched the class.. so at the end of the day I was out $60 for tank $30 in acrilic $15 in gas $6 in silicone +time.. the side's are almost never tempered the bottom always is.. so for my 90 I just bought an 30 gal acrilic for $250 no more time waisted