TARARIUM Aquarium Power Filter w/Surface Skimmer for 20-55 gal. Saltwater & Freshwater Fish Tank Hang on Back Filter 158GPH Double Waterfall Suspension Oxygen 4-Stage Filtration System

?4-stage Efficient Filtration?W/ filter sponge and activated carbon filter plate, can make the cloudy aquatic tank clean and clear. Reduce your tank maintenance?save time and effort. (Can't kill green a-lgae.) ?Efficient Surface Skimmer?It can automatically adjust the height to clean the surface oil scum.(Note: water level must be higher than the fixed pipe outlet of the surface skimmer.) ?Quiet 40dB & Adjustable Flow?You can adjust the top knob to set a gentle flow to make it comfy for delicate fish or shrimp. Machine noise <40 dB (About 1 minute of noise may occur during pumping.) ?Notes for Use?1.It takes 15-65 seconds for water to flow out of the canister, it DOESN’T NOT WORK, please wait patiently.2.Fill with water before use; 3.Watch the water levels during use. 4.Maintenance: 2-4 weeks; 5.Check to ensure the connection is secure; 6.A detail installation VIDEO is on Amazon! ?12 Months Warranty?Professional after-sales team, have any problems? Please feel free to contact us first. A satisfied response will be provided to you within 24 hrs.