Aquarium decoration: 100% imitation tree trunk, looks very exquisite and lifelike, make your fish tank an ornament. Create a natural environment: Decorating the trunk of tree could help create a more natural aquatic environment and make your aquarium or terrarium more realistic and vivid. Entertain Your Fish: Ideal for entertaining, breeding or hiding places for small fish. Cave decoration gives your fish the home they’ve always dreamed of. Non-Toxic And Safe: Made of Polyresin. Materials Materials and colors absolutely non-toxic, the biological balance is not affected and is suitable for freshwater and saltwater aquariums