Castle with Weir Aquarium Ornament, will look great in any Fish tank & Aquarium ornament. Small Fish will be able to swim thru the bridge. This aquarium ornament is great for decorating your aquarium with minimum maintenance. They are 100% safe for fish made from special resin that is non toxic and designed specifically for use in aquariums and fish tanks. Will not alter Ph levels. Wash in water prior to using in aquariums. Castle with Weir Aquarium Ornament 6 Inches Long, Fish Tank DecorationProvides Coverage for Shy Fish | Aquarium Wizards Castle with Caves Fish Tank Decoration