Tank build

[Driscoll]

Im looking for a place to buy glass, I’m doing a 500 gallon build. I’m new to the DMV area, does anyone have any suggestions.

[YHSublime]

Welcome to the area. That's a big tank! I have no recommendations for you, but welcome to the club, somebody here will!

[DFR]

I’ve purchased 1/2” for my set-up from Action Glass in Beltsville MD.  Their prices are pretty competitive and Brian seems to have an affinity for tank builds so he’ll probably work with you.  Since they don’t keep the thicker panes in house, you will have to wait some time for them to get it in and cut to your specific dimensions.  
There was also a shop somewhere near Dulles that I did consider but went with Action Glass because of convenience.  (Plus after going in and actually speaking with Brian, I felt comfortable supporting them)