First ham ham since childhood, how’s my setup?

It’s a 50 gallon tote enclosure with about six inches of aspen bedding and paper bedding on top. There a bowl of plane aquarium sand that he seems to be using as a little pan already. Is it bad to leave it in there full time or should I take it out and put it in for a few hours at a time? I’m feeding Mazuri pellets and sunburst seeds. How much do you generally feed? Do I just keep the bowl full all the time? I don’t want him to get too chubby lol. And how often should he gets fresh veggies as a treat?

Sorry for the photo quality of the ham I just got him and I don’t want to stress the poor boy.