The sponge filter offers effective mechanical and biological filtration while generating fine bubbles that enhance oxygen levels in your aquarium. Key Benefits: - Dual Filtration: Provides both mechanical and bio-filtration, maintaining clean and healthy water. - Oxygen Enhancement: Creates small bubbles that improve oxygenation, benefiting your fish. - Easy Maintenance: Simple to clean—just rinse in used aquarium water and squeeze for optimal performance. Design Features: - Two Media Containers: Includes ceramic balls in two separate containers, allowing for easy adjustment and cleaning. - Compatibility: Suitable for aquariums up to 55 gallons and ideal for smaller fish species like dwarf shrimp, guppies, and killifish. Functionality: - Requires an air pump (not included), which can be easily connected with an airline into the unit. - Comes with two covered sponge filters and two spare sponges (totaling four sponges). Practical Use Scenarios: - Ideal for shrimp tanks: Provides a safe environment with gentle filtration. - Perfect for breeding setups: Keeps water quality high, ensuring the health of fry. - Versatile for various species: Works well with small-sized fish and maintains a balanced aquatic ecosystem. This sponge filter is a reliable choice for aquarium enthusiasts looking to maintain a healthy and thriving underwater environment with minimal hassle.