In my indoor enclosure I have 70% topsoil and 30% sand (roughly). Mine just dig down in the soil/sand when they're in their house, so I don't have anything else in there.
I just pick their weeds/plants daily and put them in their enclosure. I am growing weeds in trays and will when ready sink the trays in the soil so they can graze.
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Lynne x 
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