A good soak with vinegar and water is all you need for the tank. As far as the sand goes, if it came right out of a system, I would rinse it well, till the water runs clean, and use it. If it has been sitting around for more than a couple of day, I personally would just go with new sand. Also, I would not go with the bagged "live" sand. I think it's a waste of money. Instead, I would go with the dry sand, and get a couple cups of sand from a fellow reefer to seed it.