Just give him time. He's in a new enclosure, he's going to be nervous about it because he has no idea what's in it, and is in a new spot. He'll eventually move around and find out there's nothing wrong and start being his normal self. Just make sure to have some food in there in case he does decide to eat. I'm building a 6x4x5 enclosure for 2 basilisk, i'm sure they're going to take a week or 2 to get used to it.