Zoo Med HydroBalls Clay Pellets - 2.5 lb bag

Create a self-regulating humidity system and promote healthy plant growth in your terrarium with Zoo Med HydroBalls.

These expanded clay pebbles form a base layer beneath your substrate, creating an underground water table that releases moisture as needed. Simply add water to the HydroBalls to create a natural "aquifer" that increases humidity levels for tropical species. This versatile substrate also promotes excellent root growth for live plants and can be used for filtration in waterfall setups.