I upgraded my tegu's cage over the weekend. It is an aquarium, just like his last one, just much bigger. I am using the same type of substrate and the same cage furniture. He was introduced to it last night, and after exploring for about an hour, he settled down & went to sleep under his favorite rock. Today, however, he has been pacing back & forth, in every corner, trying to get out, and inconsolable--he doesn't want to eat, doesn't want a bath, doesn't want to be petted, doesn't want out on the floor; in other words--he is just plain unhappy. I am about to put him back in the old cage for the time being, as I am upset seeing him so unhappy. Any suggestions? Has anyone had a similar experience? This new setup is definitely better for him in several ways; yet, he is very stressed. I upgraded him once before, and it was no big deal. He adjusted to it the same day.