I would start out with a much much lower number of worms unless you plan on using the vast majority for a compost heap or something. Red wigglers will have no problems populating your growbed once it's established. I would just go buy a cup of em from your local fishing store and call it good.. but seriously, don't add worms until you have a solid bed going.. if you do you'll have to suppliment feeding the worms with leftover veggie matter for a bit until you bed gets established. The worms will try to leave if there isn't enough food for them and nobody wants worms on their floor or worse yet starved dead worms in their growbed.. ick. start small with the worm colony, let it establish itself.