This realistic decoration from EBI is made of polyester resin. Non-toxic, it will not affect the biological balance of your aquarium. This decoration is suitable for both freshwater and saltwater aquariums. Tip: Carefully remove the decoration from the box and rinse it with warm water. Caution: Do not use soap, all-purpose cleaners, or other cleaning products (e.g., hydrogen peroxide, thinner, turpentine).