I'm confused, I've always found acrylic tanks to cost more than glass. Mostly due to the fact you usually have to use thicker acrylic. For that size tank you could use 3/4" glass but will need 1" or thicker acrylic unless you want a bulge. Plus tank builders usually charge more for acrylic work as it's more time consuming.
Even with the same thickness I get glass cheaper than acrylic. Less scrap with glass as it comes in larger sheets while acrylic is usually 8x4 meaning you'll need 5 sheets for that tank. The glass for that tank should be around $2000 not $5000, and that's here in Saskatchewan where glass tends to cost more.
One more note, if you're building a 600 gallon tank and already worried about expenses before you have the tank, go smaller! Bigger isn't always better, quality is better than quantity.
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