First, check out the care article on the left to make sure you've got your bases covered. Then post a picture of the enclosure along with what you've been keeping the temps and humidity at. Also what type of food are you feeding him and how often? It could also help if you could post a pictures of him. With these things the members on this forum will probably be able to tell you if his behavior is for environmental reasons or simply a normal "getting use to his surroundings" response. For example if his tank doesn't have enough hides...hell spend his first few days looking for escape routes then hunker down and hide the best he can if he doesn't feel secure. That's what I'm referring to when I say environmental. Post some pics and we'll see if we can help.