Exo Terra Bioactive Volcanic Reptile Substratum, 2-kg bag; Turn your slithering sidekick’s home into an oasis with the Exo Terra Bioactive Volcanic Reptile Substratum! This handy substratum features natural volcanic soil, formed from andesitic and rhyolitic tephra, in the mineral-rich foothills of the Aso Volcano in Japan. This naturally bioactive soil features a nutrient-rich, porous surface that provides drainage and aeration to help support strong root growth. It’s specifically designed to create a self-sustaining, living terrarium ecosystem. It also helps to eliminate ammonia and odors, as well as decompose biological waste to help keeping the terrarium clean. This beneficial substratum is sure to be a win-win for you and your scaly sidekick!