They eat loads of things. I keep mine in a substrate of:
-white bran
-red bran
-12 grain mix
-rye flakes
-fish food flakes
-rolled oats
-pablum (mixed fruit type)
-spirulina
-oat bran
I also provide them with a variety of mixed greens (collards, spring greens, dandelion, etc), veggies (peppers, squash, zuchini, etc), and fruits (melon, pear, grapes, etc). Carrots, apple, potato work fine as well, but they are mainly for moisture as they do not have much nutritional value, so I feed those infrequently.
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