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Preparing a terrarium that mimics your reptile’s natural environment found in the wild begins with choosing the appropriate substrate and this Thrive Bioactive Substrate Kit provides you with just that. Substrate is the foundation of their habitat and the most important component of a reptile’s environment. A bioactive setup with proper water drainage bioactive soil and live plants allows you to introduce microfauna like isopods that reuse and recycle nutrients within the habitat. This creates a self-maintaining and self-sustaining mini ecosystem. It requires less upkeep and gives your reptile the most realistic environment to thrive. Only at PetSmart.