Live sand is good for reef tanks. Crushed coral holds in nitrates and nitrites. You should definately go with live sand because it has living organisms in it along with good bacteria. HTH!
All LS is not created equal. Make sure you get Live aragonite sand, that is very important in helping buffer your tank.
I recommend you read my post to all new reef keepers too.
BurnNSpy
Thanks Damsel, Wolf, and Burn for the advice. I am just so used to gravel that I thought crushed coral would be better... One more question, when you change the water, do you use a gravel cleaner?...