Offering outstanding 3-stage filtration, increased water movement and vital aeration, Fluval U-Series internal filters are the perfect solution where external filtration is not possible. Designed for aquarium up to 65 gallons Use as a primary filter for smaller aquariums, or supplementary filter for larger aquariums Position horizontally for shallow tanks, larger tanks with low water levels, or to create a decorative waterfall feature Position vertically against aquarium wall to create currents or customized flow patterns Convenient flip-top lid allows for quick and easy access to filter cartridge for maintenance or replacement Adjustable 3-way flow control Top Output for circulation and oxygenation, Integrated Spray Bar for a gentle even flow, and Bottom Output for deepwater agitation BioMax biological media included Made in Italy Ideal for freshwater, saltwater and reptile environments