This Aquarium Decoration features a castle perched on a rocky hill, with cone shaped roofs and stone details. The ornament is made of safe, durable, fish-safe resin that can be used in both freshwater and saltwater tanks. The product not only provides beauty for your tank, but also gives your fish hideaways and passageways to reduce boredom. You can use this ornament alone or combine it with other Penn Plax decorations for a custom look (sold separately). Give your fish a place to play, hide, and rest, with this 6 inch Penn Plax Deco-Replica ornament.