This colorful skull is an ornament from Aqua Della's 'Dia de los Muertos' series. It is not only colored but also coated with a special paint. The ornament glows in the dark and is fluorescent under blue light. This ornament is made of polyester resin. It is completely harmless and has no effect on the biological balance of your aquarium. The decoration is suitable for both freshwater and saltwater aquariums. Care instructions: Carefully remove the decoration from the box and rinse it with lukewarm water. Caution: Do not use soap, all-purpose cleaners, or other cleaning products (e.g., hydrogen peroxide, thinner, turpentine).