1. Mechanical filtration: Small aquarium sponge filters can effectively capture debris, food residues, waste, or other impurities in water. Prevent them from entering the aquarium and keep the water clean. 2. Deep cleaning: The built-in micro filter ball helps to block large particles and accumulate beneficial elements in water. Provide biological filtration to completely remove excess harmful substances 3. Small internal filter: suitable for small-sized fish tanks, suitable for breeding and feeding various ornamental fish, shrimp or fry. 4. Detachable submersible filter: The biological sponge filter and gas stone can generate a series of dense bubbles in the water, greatly promoting oxygen circulation and maintaining the health of your fish. 5. Easy to clean: The biological sponge filter can be easily separated for cleaning. Rinse the sponge with aquarium water every 2 to 4 weeks. Avoid soaking or cleaning in tap water! Replace the white sponge every 2-3 months. Product Name: Small Fish Tank FilterMaterial: PlasticsSize: 6.8 * 5.7 * 5.7cmWeight: 0.08kgColor: Standard color