For aquariums up to 3 gallons. The Whisper In-Tank Filter moves water using air to filter your tank. For aquariums up to 3 gallons. The Whisper In-Tank Filter moves water using air to filter your tank. This creates an ideal small tank environment for keeping delicate fish and breeding fish. Install the filter on the back wall of your tank--its small size makes it easy to hide with a plant or other decorative object. Filter measures just 2.5 inches wide x 1.75 inches deep x 4 inches high.
Has the same quality and performance of an external power filter.
The air-driven design filters up to 20 GPH while oxygenating water.
Adjusts easily to high or low water levels with included mounting suction cups.
Includes filter, UL-listed air pump (115V 60Hz 1.2-watts), small Bio-Bag filter cartridge (additional replacement filter cartridges sold separately), and two feet of airline tubing.