05-14-2013, 06:17 PM
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All of the sites I visited regarding building your own tank stressed that height was the most important dimension when considering thickness of glass, acrylic, etc. You can add strength for length and width with cross supports at the top and bottom. It's worth looking into many options with a tank of this size. As has been mentioned, plywood for the back and sides would be an economical way to go. You'd use epoxy paint on the plywood to seal it in the safest way.