HIERYAN Circular Fish Tank Filter, Aquarium Hang on Filter, Small Fish Tank Filter with Biochemical Sponge, Suitable for a Circular Fish Tank with a Diameter of 5.35″ - 7″

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About This 【Upgraded Curved Design】: Very suitable for circular fish tanks, with a more sturdy installation and safe use. Create a clean and healthy environment for your beloved fi sh. Suitable for Fish Tank Diameters of 16.7-17.8cm (5.35''-7'' ) 【3-In-1 Function】: Integration of three functions: bacterial cultivation, oxygenation, and filtration, reducing the frequency of water exchange and allowing water quality to be recycled. Not only can it purify water, but it can also help aquatic pets and plants grow. 【4 Types Filter Material】: The filter comes with a biochemical cotton filter element, filter plate and two bacterial filter materials, which effectively cultivates nitrifying bacteria. You can mix and match other filter materials to meet the filtration needs of various fish for different water qualities. 【Adjustable Water Flow Rate】: By turning the knob, the flow rate can be changed as needed. Appropriate water flow rate can enhance the solubility of oxygen in water and bring a large amount of oxygen into the water, making fish more active and healthy. 【Efficient And Silent】: Our circular aquarium filter operates quietly, providing a comfortable environment for fish to grow up healthy and happy, while also providing you with a quiet night. Feel free to contact us if you have any questions. Thank you. Show more