The term bioactive is used to describe a miniature ecosystem created in a terrarium or vivarium. In a functional bioactive habitat, small invertebrates (aka clean-up crew) break down waste from your pet to make nutrients available for live plants to consume. This incredible living network forms a balance that can reduce the maintenance of your habitat while enhancing its natural appearance. The right substrate mix is critical to a successful bioactive habitat. The contents of this kit were carefully selected. to help your pets, plants, and clean-up crew collectively flourish.Provides the perfect foundation for your bioactive habitatThe all-natural North American sphagnum moss prevents soil compaction and slowly releases moisture to help create a stable, high-humidity environmentReptisoil provides a special blend of humus, peat moss, sand, and carbon to create the perfect bioactive base to support plants, soil critters, and beneficial microbesCatappa leaves provide shelter and nutrients for your clean-up crew.Just add a clean up crew and live plants! Note: Terrarium not included