The EHC Aquarium Decoration Environments Cave Living Reef Fish Tank Resin Coral Aquarium Ornaments Fish Hide-Away Mountain Retro Rockery Crafts Landscaping is a beautiful and unique way to decorate your fish tank. Made out of safe and durable resin material, this aquarium ornament is hand painted with details that are sure to catch the eye of any fish in the tank. With its solid construction and design, this aquarium ornament provides a place for nitrifying photosynthetic bacteria to attach and create a healthy environment for your fish.