Specifically designed for 304B/404B/3000CF500 aquarium , ensuring seamlessly fit and optimal filtration for and water. Features foam and activated carbons composite to effectively remove suspended particles, organic pollutants, and odors for clear water. User friendly design allows quick installation without the need for tools or professional assistance, simplifying maintenance. Made from materials that are harmless to water life, ensuring a safe habitat for fish and plant. Ideal for both freshwater and saltwater aquariums, suitable for home aquariums or commercial display tanks, providing long lasting and efficient water purification.