For the ultimate in convenience and quiet, choose a Whisper In-Tank Filter. This filter mounts on the inside of the aquarium, rather than hanging from the outside -- making it possible to place the tank flush against a wall. The 3i In-Tank Filter uses air bubbles to move water up the airlift tube and through the filter cartridge making it ideal for keeping small fish and breeding fish. The Whisper In-Tank filter adjusts easily to high or low water levels with mounting suction cups and/or bracket. Each unit includes the filter, air pump, two feet of airline tubing and one Small Whisper Bio-Bag filter cartridge. For aquariums up to 3 gallons.
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