The Exo Terra Plantation Soil Coconut Fiber Reptie and Amphibian Terrarium Substrate Brick features coconut fiber bricks that expand to a tropical terrarium substrate. Made from sustainable plantation coco husk, it’s free of chemicals and is ideal for humidity-loving species. Plantation Soil increases ambient humidity and encourages burrowing; it’s also safe for incubating eggs or growing live plants, helping create a natural, self-sustaining terrarium ecosystem. Available in Multiple Sizes