A sandy substrate is ideal to allow for easy foraging and to facilitate burrowing habits. Several hiding places should be provided; the use of driftwood, aquarium décor, and aquatic plants (real or plastic/silk) are ideal.
The ideal environment for a pet or animal that requires burrowing and foraging is one with a sandy substrate and multiple hiding places.  Driftwood, aquarium decorations, and artificial/real aquatic plants are good options to provide these features.