Fish Tank Filter Pollution-free Purify Water Increase Oxygen Waterfall Hang-on External Filter Aquarium Accessories . Description: With round deep box shape, the small fish tank ecological filter is elegant and special. It with filter partition to prevent water blockage, fish tank wall-mount to prevent falling, suitable for 3-8mm thick fish tank wall and increase oxygen for fish. It has the effect of circulating purify water and filtering impurities. The filter can help you purify the water in your fish tank, balance the water quality and provide a fresh and clean water environment for fish and shrimp, thus improving the survival life of fish. It is constructed of plastic material. The diameter of the product is 8.5cm, the height is 9cm, suitable for 0.3-0.8cm fish tank wall. It is suitable for round fish tanks, farmed fish and shrimp and green plants. Item Name: Fish Tank Filter Material: Plastic Features: Eco-friendly, Multifunctional, Low Noise Size Details: Diameter: 8.5cm/3.35" (Approx.) Height: 9cm/3.54" (Approx.) Suitable Fish Tank Wall: Length: 0.3cm-0.8cm/0.12"-0.31" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Fish Tank Filter