The XINYOU XJ-280 Super Biochemical Sponge Filter (Medium) is an enhanced, larger-capacity filtration solution designed for medium-sized aquariums. It provides dual-action mechanical and biological filtration while gently aerating the water column, making it a reliable choice for community tanks, breeding setups, and shrimp habitats. Key Features Expanded Biological Surface Area: Features a larger high-density, porous sponge cylinder that offers significantly more room for beneficial nitrifying bacteria to colonize compared to smaller models. Efficient Mechanical Trapping: Captures floating debris, fine particles, and uneaten food, preventing them from clouding the water and keeping your tank looking pristine. Dual-Purpose Aeration: Driven by an external air pump, the rising column of bubbles continuously oxygenates the water while powering the internal water draw. Sturdy Weighted Base: Built with a wider, weighted plastic base to keep the larger sponge firmly anchored to the aquarium floor without tipping over. Adjustable Output Lift Tube: Includes a telescopic clear output nozzle to direct water flow and accommodate varying water depths. Practical Usages Medium Community Tanks: Ideal as a primary or supplementary filter for aquariums typically ranging from 20 to 40 gallons. Shrimp and Snail Habitats: Safe for delicate bottom-dwelling livestock and baby shrimp, preventing them from being pulled into power filter impellers. Breeding and Grow-out Setups: Provides stable biological filtration for fry tanks where a gentle current is necessary. Hospital or Quarantine Tanks: Quick to set up and cycle, providing reliable temporary biological filtration for medical treatments. Dos and Don'ts Dos: Do clean the sponge periodically by rinsing and gently squeezing it only in old aquarium water siphoned during water changes to protect the bacterial colony. Do use standard airline tubing connected to a reliable air pump and an inline check valve to ensure safe operation. Do pair it with a dual-outlet pump (like your AquaNice 5W pump) if you want to run two XJ-280 filters simultaneously across one or two tanks. Don'ts: Don't wash the sponge under untreated tap water, as chlorine and chloramines will destroy the beneficial bacteria. Don't place the air pump below the water level unless you have installed a functional check valve to prevent back-siphoning. Don't completely replace the sponge media unless it is physically worn out, as older sponge mass holds your established cycle balance. Working Implementation Guide Components Needed: XINYOU XJ-280 Sponge Filter Unit Air Pump (Compatible with medium-load tanks, such as a 5W dual pump) Standard Airline Tubing (4mm/6mm) Check Valve Assembly and Installation Steps: Assembly: Insert the central vertical lift tube into the weighted black base, then slide the larger cylindrical black sponge over the core. Attach the extendable clear output nozzle to the top. Placement: Submerge the assembled filter and place it flat against the bottom glass in an area of the tank with good overall water movement. Tubing Connection: Attach your airline tubing to the air inlet nozzle at the base of the filter. Pump Integration: Run the tubing to your air pump (ensuring a check valve is integrated along the line if the pump sits below the tank height). Operation: Turn on the air pump. The steady stream of rising bubbles will draw water through the porous sponge walls, filtering and oxygenating the tank simultaneously.