I would rather go with LS. It's better that way, at least you don't have to vaccum. But you can purchase southdawn sand from Homedepot, it's a lot cheaper that way. Do a research in this site and see, there's a few places that sells the aragonite based sand. Then you just seed it with live rock and it'll eventually become live like mine. Mine was regular sand, now it's LS. :happyfish