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. For 3g-10g aquariums.
Use Instructions: 1. Attach the filter hanger to the track on the back of the filter by aligning the water drops. 2. Clip the filter to the back wall of your aquarium frame. If the hanger doesn't fit, you may need to order separate suction cups.3. Insert the Filter Cartridge and Bio-Foam(Note: the Bio-Foam is marked “front” and should face the front of the Internal Filter.) 4. To adjust the height of your filter, simply slide the filter up or down along the hanger track. If you can't position the filter to your desired water level, you may need to order suction cups (see spare parts list to order). For low water level terrariums, you may set the filter on a ledge or aquarium bottom.5. Once the filter and water level is within the recommended parameters, plug in the filter. Avoid using sand in the aquarium as this clogs the filter.