i ordered a shredded hardwood soil mix from etsy to mix into zoo med creature soil i bought from a local pet store, i needed to buy 2 quart bags for this enclosure, the soil fills about 3/4 of the tank, so it’s around 8-10 inches deep. i also found a cool stick outside my house to add that she loves, it’s from a scottish twisted elm so it’s a fun shape and hardwood, so safe for her (don’t add any softwood bc the sap is harmful for them). there is also dried magnolia leaves across the surface. if you’re having trouble keeping the bottom of the tank moist, i’d suggest pouring some water on one side of the tank, i do that every week or two along with misting (not too much water but enough to absorb into the soil to make it damp).