I haven't been able to measure the glass. Is there an easy way to measure it since it has a frame? I'm pretty sure I won't be able to measure the base, the tank weighs about 600-700 lbs empty. I know the glass is pretty thick, I will try to measure it later.
I guess I didn't make it clear but I'm not positive if it had a center brace it all. If it did, then whoever removed it, did it very cleanly. I can't tell that there was ever a brace on the tank. It is definitely an older tank, I am going to see if it has the year on it later today.
The only thing that makes me nervous about not having the brace is because of how tall it is. 30" tall without a brace makes me extremely nervous but I wouldn't doubt that it was made this way.