The Remarkable Roly Poly: Your Terrarium's Diligent Clean-Up Crew Enhance your terrarium's ecosystem and add a touch of charm with the introduction of Roly Polies, also known as Isopods. These captivating crustaceans, with their segmented bodies and endearing ability to curl into a ball when threatened, not only add a unique visual element to your miniature world but also serve as diligent decomposers, tirelessly breaking down organic matter and maintaining a healthy environment for your plants and other inhabitants.