GBSELL Aquarium fish tank plant creature aquarium decoration Decor landscape Material: plastic and ceramic; Height: Approx 29.5 cm / 11 " Without any requirement for lighting and carbon dioxide. Designed with a weighted base, so that they can stand firm in the tank. They are absolutely safe for fish, they will not get hurt, rot or cause any algae problems. Provides a beautiful decoration for your aquarium, is also an excellent hiding place for fish, which adds extra fun to play.