Hi all, I'm currently building a 8ft x 8ft x8ft paludarium during my spare time. The bottom 4ft is intended to be water. My main question is to do with the bottom glass viewing window. The viewing window will probably be 6ft x 3ft or I'm willing to make it smaller if necessary. So when using a glass thickness calculator would I relate it to the 6x3 window only or the actual length and depth of the water which would be 8x4ft. Thanks in advance.