For the ultimate in convenience and quiet, choose a Whisper In-Tank Filter. These filters mount on the inside of the aquarium, making it possible to place the tank flush against a wall. The In-Tank Filter will function in as little as 2 inches of water, making it ideal for terrariums, or for creating a waterfall. The In-Tank filter adjusts easily to high or low water levels with mounting suction cups and or bracket. The placement of the filter inside the tank and its uniquely shaped discharge eliminate practically all noise during operation. It truly is the "Silent Filter".