There are a lot of professional companies that do an external frame made of either steel or aluminum. I mean that every joint is surrounded by metal, not just the top and bottoms of the tank.
a metal frame is easy to make and actually it wouldnt be that expensive compared to a custom made acrylic tank. You could spend 10k+ on a tank that size if made from acrylic.
Figure out your dimensions, have a shop make a frame made of 3/8" thick angle iron and then powder coat it. Get your glass cut and then silicone it in. Vwalla, tank.
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