Galápagos Bioactive Soil. Galápagos Bioactive Mix is the perfect blend of: Tree Fern, Fir Bark, Tropicoco® Soil, Sphagnum Moss, and Charcoal. This substrate creates the ideal soil with the optimal balance of drainage and moisture retention for tropical plants to thrive and grow. Great for bioactive terrariums, live plant terrariums, or even tropical house plants. Optimal Balance for moisture retention and drainage in tropical enclosures 100% Safe: Free from salt, chemicals, and toxic oils Proven Recipe: Time tested soil mix Bioactive Soil: Add microfauna and plants for a self-sustaining ecosystem Grow Plants! Rich soil blend for tropical plants Available Size: 8QT / 24QT resealable bag