Instead of sand on the bottom you try pine or cedar shavings like they use for small animal bedding.
Never put fresh conifer wood of any kind into an aquarium! The sap and oils are very irritating and toxic. It's okay to use old, waterlogged conifer wood, but never fresh shavings or other parts of the tree that haven't been cured out by aging in water.
Very sleek build on the box. Serious skills right there.