Hello,
When do you have his lights come on? Do you see him before you leave in the morning?
You could have his lights come on at say, 8:30 or 9am & go to 8:30 or 9pm. If you are putting greens in for him in the morning before you go, you could also try getting some phoenix worms to have in the tank also, for him to eat/snack on while you are gone.
Once you get home, you could feed him a couple of more times, before his lights go out. Remember, he needs about 2 hours to digest before his lights go out.
Tracie