Zoo Med All Natural Reptile Terrarium Moss Substrate is a green product made from harvested moss using sustainable methods to ensure that it will be around for future generations. For amphibians and wetland environment reptiles. Great for use in humidifying shelters for all type of reptiles and amphibians. Excellent for use as egg-laying and incubating medium for a variety of reptiles. Natural Sphagnum Moss: Size: 15-20 gal.