i use this stuff to make a dig box for my boys, not for their cage though I put it in the playpen

https://www.amazon.com/dp/B078PQLHX4?ref=ppx_yo2ov_dt_b_product_details&th=1

https://www.amazon.com/dp/B08BX91HXZ?psc=1&ref=ppx_yo2ov_dt_b_product_details

its a bit of effort to rehydrate the dirt. put a layer of dirt down then sprinkle in some seeds then put some dirt over top, keep hydrated and takes about a week to sprout then I give it to them as they like to munch the freshly sprouted seeds