Hello all. I wanted to embark upon the project of building a tank with some old windows I have from a remodel. The problem is, it appears to be pretty thin glass, maybe 2-3 mm. All the calculators and such I can find start out with a large size and 6mm, and seem to be for unbraced tanks. I was planning on bracing mine on the top and bottom, probably like a store bought tank but with cross bars on top and maybe plywood bottom as well. The window size is 24x15, and I wanted maybe 15" deep. I also contemplated doubling up the panes with the storm windows, although that would diminish the view...I have no idea how big I can go, anyone had any luck with this?