The BioDudes handcrafted bioactive substrate for Tarantulas, Scorpions, Spiders, Vinegaroons and other invertebrates. Terra Aranea is a one of a kind substrate that was thoroughly tested for over a year prior to it's release in 2019. Terra Aranea substrate is specifically designed for all biomes that can get very dry and arid or in a high humidity biome. This substrate is designed to hold the perfect amount of water while allowing for evaporation, preventing anaerobic bacteria growth, which is a common fight when dealing with inverts and terrariums. When used in conjunction with the soil inoculants and clean up crew it encourages the full self-maintaining bioactive environment, while ensuring your invert gets the exact husbandry they need. Terra Aranea also retains all burrows and hides. I have found this substrate brings out many of the instinctual niches that many different invertebrates do in their daily life. Not only does it hold a burrow, it also holds a complete tunnel when the moisture content is held at 25%-75%. Terra Aranea provides excellent organic nutrition for your vivarium by creating necessary air pockets for root development and plant health. These air pockets are also necessary for the springtails and isopods to create a sustainable population in the vivarium. There is no drainage layer needed for the Terra Aranea. SHIPS VIA FED EX GROUND.