Fish Gear Stone with Tree Aquarium Ornament. Add some natural charm to your aquarium with this Fish Gear Stone with Tree Ornament. Made of safe, non-toxic material, it can also be used in reptile terrariums. Its natural appearance will enhance your aquarium's landscape, and its flat hollow back allows for flat placement against aquarium glass. Natural appearance adds to your aquariums landscape. Made of safe, non toxic material. Flat back for direct placement against glass Can also be used in reptile terrariums. Approx. 26 cm (10") base Approx. 25 cm (9.5") height