Zoo Med HydroBalls
If you have a tropical bioactive or naturalistic terrarium with live plants, it's easy for the substrate to get soggy and compacted. When this happens, soil health declines and undesirable bacteria and mold start to take over!
Zoo Med HydroBalls act as a drainage layer under your primary substrate to create an underground reservoir. You can add water to this natural "aquifer" to increase humidity levels in your enclosure, or you can leave it empty to give excess water somewhere to go.
For best results, place Zoo Med Naturalistic Terrarium Substrate Mesh between the substrate and HydroBalls.