Zoo Med Eco Earth is a coconut fiber substrate that is ideal for terrariums housing burrowing animals, especially reptiles, amphibians, small animals and insects. It can be used to increase humidity in an enclosure and to help absorb and break down foul odors and waste. Additionally, because it's made from the husks of coconuts, Eco Earth is designed to be safely composed or recycled when it's ready for disposable, so it's the perfect eco-friendly choice for the terrarium enthusiast. It can also be paired with Zoo Med HydroBalls to create a drainage layer that encourages better plant growth, humidity and drainage in your naturalistic terrariums. Big Al's Pets offers Eco Earth in either a single brick or an economical three-pack option. Each brick expands to make between 7 and 8 liters of substrate.