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Tetra Whisper 170 GPH Internal Power Filter
An in-tank power filter for 20 to 40 gallon aquariums that clips to the glass and takes large Whisper Bio-Bags.
- Internal filter for 20 to 40 gallon aquariums
- Clips inside the tank, about 1 inch wall clearance
- Uses large Whisper Bio-Bag cartridges
- Floss traps debris; carbon removes odor and discoloration
- Adjustable clip for high or low water levels
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Pros
- No rim space needed behind the tank
- Easy to hide behind decor
- Works with partly filled tanks
Cons
- Takes up space inside the tank
- Ongoing cartridge cost
- Flow may be strong for bettas
At a glance
An in-tank power filter for 20 to 40 gallon aquariums that clips to the glass and takes large Whisper Bio-Bags.
A practical in-tank filter for 20 to 40 gallon tanks that sit close to the wall or have no room for a hang-on.
- Internal filter for 20 to 40 gallon aquariums
- Clips inside the tank, about 1 inch wall clearance
- Uses large Whisper Bio-Bag cartridges
- Floss traps debris; carbon removes odor and discoloration
- Adjustable clip for high or low water levels
Product Specifications
- Brand
- Tetra
- Model
- AQ-65818
- Tank size
- 20 - 40 gallons
- Cartridge
- Large Whisper Bio-Bag
- Color
- Black
- Dimensions
- 5.85 x 5.09 x 10.29 inches
- Weight
- 1.5 pounds
The Tetra Whisper Internal Power Filter clips to the inside wall of the aquarium instead of hanging over the rim. This model is sized for 20 to 40 gallon tanks. Water passes through a large Whisper Bio-Bag cartridge, where the floss traps debris and fish waste and the carbon helps remove odor and discoloration.
Why choose an internal filter
A hang-on filter needs a few inches behind the tank. This one sits inside, so Tetra says the tank can stand about an inch from the wall. It also hides more easily behind plants, rocks and decor. That makes it handy for tanks in tight spots, and for setups where the lid or hood leaves no room for a hang-on unit.
Water level flexibility
An adjustable clip lets you mount it higher or lower. That’s useful for tanks you keep partly filled, like turtle tanks or paludariums, or for setups where the water level changes between top-offs.
Cartridges
It uses the large Whisper Bio-Bag cartridges. See our page on the Tetra Whisper Bio-Bag cartridges for how often to change them and how to keep the bacteria living on them.
Flow
Tetra names this model 170 GPH, though one line of the listing mentions up to 200 gallons per hour. Treat it as a moderate-flow filter for a community tank. Fish that prefer still water, like bettas, may find it strong.
Maintenance tips
- Unplug it before you lift it out.
- Rinse the intake grille when flow drops.
- Change the cartridge on a different day from a gravel clean.
Who should look elsewhere
If you want more media room, a hang-on like the Tetra Whisper IQ or a canister holds more. In a shrimp or fry tank, a sponge filter is safer.
The Bottom Line
A practical in-tank filter for 20 to 40 gallon tanks that sit close to the wall or have no room for a hang-on.
View on Amazon →As an Amazon Associate, AquaticRig earns from qualifying purchases.
Frequently Asked Questions
What size tank is it for?
Tetra lists it for 20 to 40 gallon aquariums.
Which cartridges does it take?
Large Whisper Bio-Bag cartridges.
Can I use it with a low water level?
Yes. The adjustable clip lets you mount it higher or lower.