[Improve water quality] The pores of the sponge filter have a large surface area, where aerobic bacteria can spread. Growing nitrifying bacteria can provide excellent biological filtration for your water tank. Betta fish, fry and other small fish will never be sucked into the filter. The slow flow of this filter is ideal for breeding and spawning discus, dwarf cichlids, guppies and dead fish. [Fine filtration] When water passes through the pores, the The sponge traps dirt in your tank, making the water clear and transparent. It is very effective and can decompose toxic waste in the water tank. Easy to clean and reuse: the sponge can be used multiple times. When changing water, do not use tap water, but use water from the water tank for cleaning. Simply rinse and wring a few times until water comes out of the sponge. Versatility: This aquarium filter is small and can easily hide behind plants . It is suitable for any corner, very suitable for shrimp tanks, breeding tanks, fighting fish tanks, nano tanks, turtle tanks, fish tanks, goldfish, fish juveniles or other fish. Product Description: Bio-sponge filter, excellent filter for additional biological support for any tank Specification:< /p> Material: plastic + cotton. black. main feature: 1. The sponge filter provides excellent mechanical and biological filtration 2. High quality bio-sponges increase oxygen and provide an ideal location for bacterial colonization. 3. Run quietly, generate air bubbles for a few minutes and increase the oxygen flow. 4. Simple, effective and perfect for keeping your aquarium water super clean and clear. 5. Easy to clean, just rinse the sponge and squeeze it into the water in the water tank. 6. Reliable, efficient and easy to install. Connect the tube to the air, pump and connect it to the filter. Connect the power supply. It works. Notes for children: 1. Squeeze the filter sponge into the water tank for 5 minutes before first use, it is easy to digest and form colonies. 2. Wash the sponge with aquarium water, do not rinse the sponge with tap or lukewarm water 3. It is recommended to replace the sponge every 6-8 months Packing List: 1 x Aqua Sponge Filter 1 x Aqua Sponge Filter p>