Is playsand in general ok? A couple people (one of which works at Home Depot but is a very experienced reefkeeper) told me that regular playsand may not be safe because you don't know what's in it, and Southdown isn't available in Virginia. I was encouraged to buy a bag of the "live" aragonite sand, but it seems like that was unnecessary.
Brian, to answer your question, from what I can tell, any sand you use in your tank will eventually become live sand, and if you ever set up another sand-substrated tank, you should use some of that sand in the new tank as it will already be cutured.
Isn't being new to this stuff exciting?