Check the listing for details. Aquarium Fish Tank Filter with Waterfall Oxygenation Suitable Multi Layer Filter. Condition: New. Listed at 11.99 USD. Multi Layer Aquarium Fish Tank Filter with Waterfall Oxygenation Suitable for 20-30 Gallon Fish Tanks, Flexible Mounting, Dust & Splash Protection Feature: 1. Multi Layer Filtration System: Designed for a range of tank sizes, including 10 gallon, 20 gallon, and 30 gallon fish tanks, this advanced aquarium filter features a multi chamber system. It efficiently cycles and filters water, removing impurities and maintaining crystal clear water stability. 2. Waterfall Oxygenation: Suitable for any aquarium filter setup, the waterwheel design enhances oxygenation in fish tanks. It generates abundant bubbles, significantly boosting oxygen levels, which is essential for a healthy aquatic environment in tanks of all sizes. 3. Ultra Quiet Operation: This fish tank filter operates with minimal noise, making it perfect for peaceful environments. Whether used in a 10 gallon aquarium or a larger 30 gallon fish tank, it ensures a quiet operation that wont disturb your daily life. 4. Flexible Mounting Options: Suitable for various fish tank filters, including those for 10 gallon and 20 gallon setups, this filter offers internal and external mounting options. This flexibility allows it to adapt to different aquarium configurations and placement needs. 5. Dust and Splash Protection: This filter for fish tanks includes a dust cover, preventing debris from entering and water from splashing out. Its a practical addition for maintaining a clean and tidy aquarium, whether you use it as a 10 gallon -30 gallon aquarium filter or for larger tanks.