Since 1977， Zoo Med has been creating high quality exotic pet foods， products and habitats for reptiles， amphibians， fish and other exotic pets. Zoo Med HydroBalls can be used as a base layer underneath substrates to create an underground water table in your pets terrarium. Add water to create a natural aquifer and increase humidity levels for all tropical species.

Zoo Med HydroBalls Expanded Clay Terrarium Substrate， 2.5 Lb