Sorry about all the questions but these are critical to help find out whats wrong with Steve.
It could be something as simple as it is getting used to his new setup. My snakes when i first got them they didnt eat for a week, two weeks while they were getting used to a new house, a lot of people say that after a week or so they will start acting more normal.
Beardies need a high UV % i believe and anything not high enough can possibly cause stress.
You said pets at home....a lot of people on here dont really like them as i have seen lol, and a lot of pet shops give you wrong information about how to care for your animals