Tetra Whisper 20 In Tank Filter
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 filter adjusts easily to high or low water levels with mounting suction cups 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”.
| Feature | Detail |
|---|---|
| Water Level Requirement | As little as 2 inches |
| Mounting Type | Inside tank with suction cups or bracket |
| Noise Level | Extremely quiet |
| Best For | Terrariums, waterfalls, wall-mounted tanks |
FAQ
Can this filter be used in a terrarium?
Yes, the filter functions in as little as 2 inches of water, making it suitable for terrariums.
Does the filter work with all tank sizes?
It is designed to work with tanks that have at least 2 inches of water depth and can adjust to different water levels using suction cups or bracket.
Is the filter easy to install and maintain?
Yes, it mounts easily inside the tank using suction cups or a bracket and is designed for simple maintenance.

Tracey Young –
The filter works perfectly in my small terrarium. It’s very quiet and I didn’t notice any noise even at night. Installation was simple and the filter stays securely in place.
Rachel Graham –
I used it in a wall-mounted tank and it fits well. The water flow is steady and the noise is almost undetectable. Only minor adjustment needed for the suction cup.
Andrea Langdon –
Great for small setups. It works in just 2 inches of water and doesn’t disturb the tank’s appearance. Very quiet and reliable.