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Short Summary: Tarantula Substrates The right substrate is essential for tarantula health, humidity control, and burrow stability. The most reliable mix combines compost, peat moss, and coco fiber in equal parts, offering moisture retention, mold resistance, and strong burrow support. Adding sphagnum moss boosts local humidity for tropical species. While arid tarantulas do fine with just coco fiber or compost, avoid unsafe options like sand, aspen, or gravel. Branded pre-mixed substrates are often overpriced and unnecessary compared to a DIY blend. Natural forest soil can work if parasite-free. Ultimately, a safe, balanced substrate recreates your tarantula’s natural habitat and supports healthy behavior. Introduction: Why Substrate Choice Matters When it comes to keeping tarantulas, substrate is more than just dirt at the bottom of an enclosure. The right soil mix directly affects humidity levels, burrow stability, and ultimately the overall health and behavior of your spider. A poorly chosen substrate can …