Kiwi hit the nail on the head.
I make a veggie and fruit mix from critterlove.com website.
Ohpw in a separate bowl and then just a few not expensive Happy glider cereal pieces, that I put in fresh every 3 days. (can get moldy if left out to long, the bag is in the frig.)
cereal is not needed but is good for the teeth.
at 2 lbs is about $21, and this will last a long time for a few gliders.