Bubble Shape Decoration: This eco-friendly resin is non-toxic, environmentally friendly and will not fade over time. Suitable for aquariums and circulation systems. Create water currents and underwater scenesdazzling. BUBBLE AIR - Connect this decoration to an air pump to increase oxygen and decrease CO2 levels. Create lots of small bubbles (air pump not included). Enhance your aquarium's natural landscape to add vitalityto your fish. Easy care: Measures approximately 6.5 x 6 x 11 cm and easily fits into any aquarium. With this decoration you get the ideal water landscape of your dreams. Streamlined Design: Crafted with great attention to detail, the resin material is sturdy. Does not require any particular maintenance and is easy to clean. Highly Decorative - Each topper is carefully packed to ensure it is complete, flawless and shipped to you in perfect condition. Designed for both freshwater and saltwater aquariums, can add a touch of mystery to your aquariumwhere your fish will have fun all day long.