how much sand for a 210

[ShockSniper]

I'm trying to figure out how much live sand I need for my 210 gallon reef tank. I'm pretty sure I want a DSB...unless you guys think other wise.

Thanks

[ShockSniper]

I wanted to add that i was planning on adding some crushed coral as well to the sand because I want to have a jaw fish in the tank. Would one or two 40 pound bags of crushed coral be enough?