Terry's Arid Arachnid Blend
4 lbs per bag
Terry’s Topshelf Arid Bioactive Blend is a specially formulated substrate designed for arid-dwelling tarantulas and other arachnids. It provides the perfect balance of structure, dryness, and bioactive potential. Ideal for species that prefer low-humidity environments, this blend mimics the natural terrain of desert and scrubland habitats while supporting a light bioactive setup.
This blend offers excellent drainage and stability while retaining enough moisture in deeper layers to support microfauna like springtails. The calcium-bearing clay helps maintain substrate structure and promotes springtail health, allowing them to establish and thrive even in drier conditions. Terry’s Topshelf Arid Blend delivers a clean, naturalistic foundation that benefits both your animals and the micro-ecosystem that supports them.
Ingredients: Peat Moss, sandy loam, Mushroom Compost, Redwood Compost, Sand, Vermiculite, Calcium Bearing Clay
4 lbs per bag
Terry’s Topshelf Arid Bioactive Blend is a specially formulated substrate designed for arid-dwelling tarantulas and other arachnids. It provides the perfect balance of structure, dryness, and bioactive potential. Ideal for species that prefer low-humidity environments, this blend mimics the natural terrain of desert and scrubland habitats while supporting a light bioactive setup.
This blend offers excellent drainage and stability while retaining enough moisture in deeper layers to support microfauna like springtails. The calcium-bearing clay helps maintain substrate structure and promotes springtail health, allowing them to establish and thrive even in drier conditions. Terry’s Topshelf Arid Blend delivers a clean, naturalistic foundation that benefits both your animals and the micro-ecosystem that supports them.
Ingredients: Peat Moss, sandy loam, Mushroom Compost, Redwood Compost, Sand, Vermiculite, Calcium Bearing Clay

4 lbs per bag
Terry’s Topshelf Arid Bioactive Blend is a specially formulated substrate designed for arid-dwelling tarantulas and other arachnids. It provides the perfect balance of structure, dryness, and bioactive potential. Ideal for species that prefer low-humidity environments, this blend mimics the natural terrain of desert and scrubland habitats while supporting a light bioactive setup.
This blend offers excellent drainage and stability while retaining enough moisture in deeper layers to support microfauna like springtails. The calcium-bearing clay helps maintain substrate structure and promotes springtail health, allowing them to establish and thrive even in drier conditions. Terry’s Topshelf Arid Blend delivers a clean, naturalistic foundation that benefits both your animals and the micro-ecosystem that supports them.
Ingredients: Peat Moss, sandy loam, Mushroom Compost, Redwood Compost, Sand, Vermiculite, Calcium Bearing Clay
Getting Started with Bioactive?
Creating a bioactive enclosure is an excellent way to provide your reptile or arthropod with a naturalistic, self-sustaining habitat. By mimicking natural ecosystems, bioactive setups utilize living organisms to help manage waste, support plant growth and maintain overall enclosure health. For beginners, setting up a successful bioactive enclosure starts with choosing the right substrate tailored to the species’ environmental needs.
For moisture-dependent species such as many tarantulas and invertebrates, a substrate like Terry’s Topshelf Bioactive Blend provides ideal moisture retention, structure, and microbial support through a mix of peat moss, sandy loam, composts, sand, and vermiculite. For arid-dwelling species, Terry’s Arid Arachnid Blend includes calcium-bearing clay, which helps maintain substrate integrity and supports springtail populations in otherwise dry conditions. For enclosures focused on detritivores or overall decomposition, Royal Soil offers a rich blend of organic matter, composts, and wood pulp to promote a thriving biological soil environment.
Want to learn more? Check out our Bioactive for Beginners article.