How much sand for 10 inches in a 65 gallon?

[Tom2433360]

I'm finally upgrading from a 30 gallon to a 65! This isn't super urgent, but for anyone who has bought a 65 gallon, how many 50 pound bags of sand did you use? I tried to do some maths to figure it out, but it seemed way off. I'm planning for 10 inches of sand, because my purple pinchers aren't all that big yet (I've had them for three years so far), and they tend to dig all the way to the bottom of the current 8" of substrate they have in the 30 gallon. Thanks so much!

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