Use HydroBalls lightweight, expanded clay terrarium substrate as a base layer underneath Eco Earth or other substrates to create an underground water table in naturalistic terrariums. Add water for a natural "aquifer" and to increase humidity levels for all tropical species. HydroBalls are an excellent substrate for live plant root growth and can be used for biological filtration for a waterfall. Place nontoxic Terrarium Mesh in between the HydroBalls layer and the other substrate layer to allow proper water drainage, which keep substrates from mixing and contaminating the water/filtration system.
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