Tetra Whisper Internal Filter 3 to 10 Gallons, for Aquariums, in-Tank Filtration with Air Pump, Blacks & Grays (25816) For the ultimate in convenience and quiet, choose a Whisper In-Tank Filter. These filters mount on the inside of the aquarium, rather than hanging from the outside -- making it possible to place the tank flush against a wall. In-Tank Filters are unusually quiet, since the motor is under the water. Offering the same quality and performance as an external filter, the Whisper In-Tank Filter will function in as little as 2 inches of water -- making it ideal for turtle tanks, or for creating a waterfall inside the tank.The Whisper In-Tank filter features adjusts easily to high or low water levels with mounting suction cups and/or bracket. Each filter comes with one pre-assembled Whisper Bio-Bag filter cartridge. Features & details UNIVERSAL DESIGN Tetra Whisper 10i Internal Filter is an all-in-one air pump and water filter system INTERNAL FILTER Mounts on the inside of your aquarium with clip (included) CATCHES DEBRIS Dense dual-sided mesh filters debris and fish waste AERATES WATER Air-driven design filters up to 80 GPH while oxygenating water CONVENIENT DESIGN Uses medium easy to change Bio-Bag cartridges filter mounts inside aquarium making it possible to place tank flush against the wal