Just a tip for you, that always works for me when I have a new addition to my collection that is slow to start eating for me...
I take sheets of newsprint, cumple them into balls (like you'd do before you throw into the trash can), and fill the floor of the cage until no portion of the floor of the tank is visible looking from above.
What this does is give them a huge sense of security in the cage, and they'll feel more apt to roam around in secrecy and become comfortable with their enclosure.
Once they start eating, over a period of weeks I begin to thin out the amount of balled up newspaper until the enclosure is back to normal. They don't notice and are usually fully acclimated by the time this is over.
Just a tip that has worked for me in the past.....