Yeah, no worries, just give him a few days to adjust to the new environment. Think of it as your first day at a new school when you were little - you didn't exactly jump right in on the first day. He just needs to adjust, check things out, and make sure he's safe. It's completly natural. Just offer him food at usual times, and don't mess with him in your attempt to see some action - this will only make him stay under longer. In 2-3 days, he will be all over the place, doing fine.
--Emi