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In my opinion 50 pounds is enough for a 75G. That's what I have in mine, and it's a substrate layer thick enough to grow Amazon sword plants and valisneria. I can't see why anybody would want more substrate, because it would just serve as a dirt trap.

Personally I would not use blasting sand even if I got it for free, because it is too fine. I second Nick's recommendation of Pool Filter Sand.
 
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