Hard to believe acrylic will be cheaper than glass. For the size of tank you'll only need 1/4", acrylic you'll need 3/8" unless you brace it. 1/4" starphire glass should be less than 3/8" cast acrylic. Silicone is also cheaper than weld-on and the seams are much easier and forgiving with silicon plus I think the two will look pretty similar in terms of "cleanness". Personally would go with glass, some extra money for edge polishing would be nice.
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