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. 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%.