Information about AQQA Upgraded Hang-On FilterEnhance your aquarium’s water quality with our upgraded hang-on filter. It offers powerful three-step filtration, a space-saving design, and a unique oil surface skimmer, all while operating quietly.Upgrade Hang on FilterThis filter provides a strong flow of 2W 80GPH, quickly purifying your fish tank water. Its waterfall-type water flow design is aesthetically pleasing and increases dissolved oxygen. It takes up less space in the fish tank, leaving more room for your fish.3-Step FiltrationWater passes through a triple-layer filtration system: a biochemical sponge, a layer of activated carbon media, and a layer of professional filter cotton, evolving water quality. For optimal performance, regularly replace the filter layers. Separate filter layers are available for purchase.Oil Surface SkimmerThis feature offers free assembly and can be easily installed or removed. It automatically floats on the water surface, adjusting with water level changes, and effectively removes impurities and oily film. If not needed, simply plug the installation hole.Adjustable Water PipeFreely adjust the length of the water pipe with the included extension tube to adapt to fish tanks of various heights. The outer water tank features a level governor, used to adapt to different fish tank thicknesses and keep the filter vertical.Precautions Before UseThis filter is very quiet, with noise levels less than 30dB. When you first start using it, some noise may occur if there’s air in the water pipe. Please fill the water tank with water before use to drive the water pump to pump water.Quick Specs & Fit TablePowerTank Size (US gal)Tank Size (UK gal)Best For300W25-60 gal21-50 galBetta, shrimp, nano tanks500W55-130 gal46-108 galTropical fish, community setups800W100-160 gal83-133 galLarger freshwater, discus1000W150-200 gal125-166 galKoi ponds, marine/reefTank sizes are estimates; test for your setup.Perfect for: Beginner-to-intermediate aquarists with 25-200 gallon (21-166 UK gal) tanks who need reliable 77-86°F (25-30°C) stability. Ideal if you’ve experienced temperature crashes with cheaper glass heaters. Quiet aquarium filterWhen the filter first starts to pump water, it will be a little noisy, which is normal. When the filter is running normally, the waterfall is super quiet and the sound is around 30 decibels.The pumping speed is related to the water depth, please be patient. Water Inlet filter cottonA filter cotton is installed at the water inlet of the filter, which can prevent the suction of fish and the suction of excessively large particles of sand and gravel, etc. Fixed horizontal buttonBy adjusting the distance between the Fixed horizontal button and the fish tank wall, the filter can be fixed horizontally on the tank to increase stability and viewing. Buy replacement filter cotton separatelyFilter cotton comes with 1 filter CartridgesIt is recommended to replace the Filter Cartridges according to the water quality. When the filtering effect decreases, please replace the Filter Cartridges in time.Filter Cartridges require additional purchase, a box of 6.