I think I read a few days back about someone wanting to build a tank or something and didn't know how to determine the thickness of glass to use. I may be just dreaming though or it might have been on another forum, but anyways here is a link to help you out if this is the right place .
yeah,you got the right place I was the one trying to figure out the big glass headache.
Thanks for the link/site
I'll try to figure out the formula on that site later just to double check some things,but I think I finally got it figured out.