Pawfly 3 W Aquarium Filter, 1-3 Gallon Fish Tank Filter, 65 GPH Hang On Back Aquarium Filter with Water Wheel Adjustable Water Pump & Oil Skimmer, Ultra Quiet HOB Filter for Tank Filtration

Easy to Install: Remove the sponge, add water until it reaches the outlet, plug in and wait for smooth operation, then reinsert the sponge. (NOTE: Do not insert the sponge too early to avoid blocking pump outlet, slowing water intake, and causing noise)

2-Stage Filtration: Feature a porous bio sponge that traps debris, uneaten food, and fish waste to keep water crystal clear. It also provides ample surface area for beneficial elements to thrive, helping absorb and eliminate harmful substances

Compact but Efficient: Measuring just 3.53" L x 3.56" W x 4.27" H, this aquarium filter fits perfectly in freshwater or saltwater tanks up to 5 gallons. It provides mechanical and biological filtration to keep your aquarium clean, stable, and healthy

Oxygen-Boosting Water Wheel: Built-in rotating water wheel greatly increases surface agitation, effectively boosting oxygen exchange to increase dissolved oxygen levels. This creates a more vibrant habitat that promotes lively, healthy aquatic pets

Quiet & Adjustable: With a water wheel to reduce motor noise, it runs silently under 30 dB to keep your tank calm and promote the well-being of fish. The handy rotatable knob lets you easily adjust the water flow to meet the needs of underwater life