This biochemical filter sponge is ideal for use in saltwater, freshwater, and fish tanks. Its black cotton fiber construction is tough yet flexible, allowing users to cut it freely to meet diverse aquarium needs. With effective shading properties and moderate porosity, it reduces algae buildup while fostering beneficial nitrifying bacteria, ensuring clearer water and a healthier aquatic habitat. Features -Color:Black -Material:Cotton -Size:50.00X50.00X2.00cm/19.65X19.65X0.79in -Optimal Versatility: Suitable for use in marine, freshwater, and planted aquariums, this filter sponge adapts seamlessly to various aquatic environments, ensuring reliable filtration performance and water quality maintenance -Cuttable Dimensions: The filter pad can be easily trimmed to fit different aquarium filter setups, providing users with the flexibility to tailor its size according to specific tank requirements without sacrificing effectiveness -Resilient Build: Constructed with cotton fiber, this filter sponge maintains its shape and integrity over long-term use, resisting wear and ensuring consistent filtration over time -Algae Growth Inhibition: Featuring excellent light-blocking capabilities, the sponge helps minimize algae formation inside the tank by reducing light penetration, contributing to a cleaner and healthier aquatic environment -Enhanced Beneficial Support: The moderately porous structure promotes the growth of nitrifying bacteria, crucial for biological filtration processes, thereby improving water purity and supporting a balanced ecosystem Package list: 1 x Filter Sponge