1. Comprehensive Filtration Combination: It contains a variety of filtration media such as filter cotton, magic carpet, magic bag and biochemical cotton. From physical filtration to intercept large - particle impurities to biochemical filtration to cultivate beneficial bacteria to decompose harmful substances, it purifies the fish tank water quality in all directions. 2. Overflow Magic Bag Bracket Design: The unique overflow magic bag bracket is convenient for placing the magic bag, enabling the water flow to pass through the magic bag more efficiently for filtration, improving the filtration efficiency and reducing the accumulation of debris in the fish tank. 3. Compatible with Bottom - Filter Systems: Specifically designed for bottom - filter fish tanks, each filtration component works together to effectively improve the filtration effect of the bottom - filter system, maintain the ecological balance of the fish tank, and allow fish to live in a clean and stable water environment.