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Tetra

Tetra Whisper Internal Filter For Aquariums, In-Tank Filtration With Air Pump

    • Based on 15,614 reviews
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Availability: Only 5 left in stock, order soon!
Fulfilled by MJZone
Arrives May 22 – May 24
Order within 10 hours and 58 minutes
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Size: Up to 30-Gallons


Features

  • UNIVERSAL DESIGN Tetra Whisper 20i Internal Filter is an all-in-one air pump and water filter system
  • INTERNAL FILTER Mounts on the inside of your aquarium with clip (included)
  • CATCHES DEBRIS Dense dual-sided mesh filters debris and fish waste
  • AERATES WATER Air-driven design filters up to 125 GPH while oxygenating water
  • CONVENIENT DESIGN Uses large easy to change Bio-Bag cartridges filter mounts inside aquarium making it possible to place tank flush against the wall
  • PRODUCT DIMENSIONS: 4.88" x 5.38" x 10.19"

Description

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.


Is Discontinued By Manufacturer ‏ : ‎ No


Product Dimensions ‏ : ‎ 4.88 x 5.38 x 10.19 inches; 1.45 Pounds


Item model number ‏ : ‎ 25817


Date First Available ‏ : ‎ July 15, 2004


Manufacturer ‏ : ‎ Tetra


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: May 22 – May 24

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • BUYERS BEWARE!!!
Size: up to 4-gallons
Review Image by Lindsey Lindsey
In late November l got another aquarium filter (the Tetra Whisper filter) because the other one was almost impossible to keep clean. This one did a great job at keeping the aquarium clean for my daughter’s Betta fish. However today the fish got caught in the bottom of the Tetra Whisper filter where the fan spins. The rear of his fin got caught in there, and he’d been fighting to get out. I immediately unplugged the filter to stop the fan at the bottom and freed him. He could no longer swim like he always had, but only sideways. He had used so much energy trying to get out and had such bad injuries that he succumbed to his injuries less than 3 hours later. Sure one might say it’s just a fish & it’s no big deal, but they haven’t had to explain to a 7 year old her fish is no longer with us. I now have to get another Betta fish but will not be getting another one of these filters. Just putting this out to try to save another family from loss of a pet. The photo is a picture of our injured fish which died less than 3 hours later. He could only swim sideways. The discolored portion of his fin is where it got sucked in & stuck. ... show more
Reviewed in the United States on December 29, 2018 by Lindsey Lindsey
    • Please READ! Dangerous item.
Size: up to 4-gallons
I never ever write reviews BUT this filter killed my very healthy and happy beta. I have never felt so much guilt because there is one review in here that says that this item is dangerous and it killed their beta. I went on all the positives and put all those feelings of doubt on the side. When my husband told me he had installed the new filter I ran down to check on my fish (Finley) and his long top fun had gotten caught in that bottom motor. I freed him immediately but 30 mins later he passed. I have never cried so much. I lost a pet; my 4 year old lost a pet and yes he was “just” a fish but we loved him. Please do not purchase this, you will regret it. ... show more
Reviewed in the United States on June 3, 2019 by Cyn Rivera
    • Great filter for bettas but SLIGHT MODIFICATION NEEDED
Size: up to 4-gallons
I love this filter. Bought it for a 7 gallon cube aquarium for my betta. Had a Fluval nano but it was too problematic and noisy. This filter is so quiet I can't hear it over the ambient noise. The flow is just right for a betta. It would be a bit weak for fish without a labyrinth organ, especially in a 7 gallon. There are a lot of reviews from unhappy people with dead fish or snails. This type of filter is well known for catching big floppy fins, like on bettas or fancy goldfish, also the antennae of snails and shrimps. You have to put a screen over the intake if you have any animal that can get limbs sucked inside. Also this is standard practice if you have any breeding animals. You can pick up some fine plastic screen at any hobby store for dirt cheap. Fasten it with anything nontoxic and metal free. I wouldn't go any finer than 1mm or it will slow the filter down and wear it out. I'd give it 5 stars but the people at Tetra need to address this issue. ... show more
Reviewed in the United States on September 24, 2020 by YoWaddup
    • How can something so simple work so well?
Size: Up to 40-Gallons
Review Image by Ronald L. Russell Ronald L. Russell
Review Image by Ronald L. Russell Ronald L. Russell
When you open the box, the Whisper 40i (or it's smaller siblings) don't seem very impressive. It's not much more than a oval plastic bucket, with another bucket (containing a motor and pump) snapped onto the bottom. If you looked at one and thought "this can't possibly work", you would be so wrong. Perhaps they work as well as they do BECAUSE they are so simple, and so have little chance for things to break. The pump sits IN your aquarium water, so it never needs to be primed. You plug it in, and it begins working, filling the upper bucket, where the water flows through the filter pad and spills back into the aquarium. No priming necessary ever, including after a power failure. When the power comes back on, it just starts working again. It's a shame that every hang-on-the back power filter can't make a similar claim, some unfortunately will lose their prime and/or fail to restart, resulting in unhappy fish and sometimes a damaged filter. There are no adjustments for flow, so these only run at one flow rate. Inevitably, some food can get sucked up if you let it run while feeding. I have the filters on a separate power strip, so when I feed my fish, I just use the switch on the power strip to turn the filters off for an hour or so. Easy solution and prevents the filter pads from clogging so quickly. There is no top or lid (unless you buy the model intended for reptiles), so the filter pads just sit there exposed. This means that the water in the filter is fully aerated as it passes through the pads. It also means that no other internal filter is as easy to change pads when they become clogged. The top edge of the pad is above the water line, so you just grab it with two fingers and lift it out. You don't have to disturb the suction cups or hanging bracket at all. You don't have to put your whole arm down into the tank. Maintenance which is easily performed is more likely to be done when needed, so easily changed pads are more likely to be changed when clogged. You have options for how you want to attach the filter. The box includes two suction cups, and a newly designed bracket which hangs over the edge of your tank. I use the bracket, as it's adjustable for height and I don't have to worry about suction cups losing their suction. The filter pads are the Whisper bio-bags, which amount to a thick fluffy poly bag, over a plastic frame, with carbon granules inside. Replacing these is simple, and if purchased in a 12 pack from Amazon, cost about 60 cents per bag. I used Emperor filters for years, and in my experience, these bio-bags work a lot better than the filter cartridges for Marineland products and cost much less to buy. If you rinse them under tap water, which is easily done, the cost is even less. Rinsing the bags doesn't disturb your biological bacteria since they are on a separate part (resembling a hair brush) which remains in the filter when you remove the bags. You do have some flexibility with regard to media options as well. You don't have to use the carbon which is included with the new pads. You can put anything you want inside the bag, and if desired, transfer it to the new bag next time you change them out. You also don't have to use the separate biological "hairbrush", and if you leave it out, you have room to put another media bag in it's place, with ceramic rings, or whatever else you can think of. I have four of these, mounted on two separate tanks, one 55 gallons, the other 75 gallons. All four of them are not quite silent, but very quiet. There is a soft, low hum from the motor windings, a little bit like a transformer humming. At first there was also a faint sound like air trapped somewhere, perhaps cavitation in the pump? But these sounds are hard to hear, and not distracting. And the cavitation sound went away on it's own after a few days. I can hear the soft humming sound if the room is totally quiet and I stand near the tank, but if there is any significant sound from conversation, crunching breakfast cereal, a radio or TV, etc, then they are drowned out. Some of the complaints others have mentioned in their reviews sound a bit like operator error to me. For example, one person said the filter overflowed and sent water over the back of the tank onto the floor. Clearly, the filter was mounted too high....mine are mounted with the top edge 2 inches below the rim of the tank. When the filter pad becomes clogged, it WILL overflow, but into the tank, not out of it. Some describe loud mechanical noises, which sounds to me like a bit of gravel, or perhaps a snail, found it's way into the pump impeller. Yes, this can happen with any filter, regardless of brand, but it's easy to repair. In these filters, the bottom just snaps off, exposing the pump impeller, which is then easily removed for cleaning. And some have complained that the filter "stops working" after some months of service. Again, this is likely due to a need for a cleaning of the impeller and the recess where it sits, where debris or gunk sometimes builds up and prevents it from rotating. On a benefit/cost basis, these filters look really good. They are made of a tough, slightly flexible plastic, so even if you drop one on the floor, it is unlikely to break. Parts for Tetra/Whisper filters are readily available everywhere. And the results are as good as any other filter I've ever used, regardless of cost. The first attached photo shows two mounted in my 75 gallon planted tank, which contains two Nigerian bichers, and two Pictus catfish. The second shows two more in my 55 gallon community tank, with various tetras, cory catfish, and loaches. ... show more
Reviewed in the United States on September 26, 2018 by Ronald L. Russell Ronald L. Russell
    • I would recommend.
Size: Up to 10-Gallons
Review Image by Jill Jill
Review Image by Jill Jill
Review Image by Jill Jill
We recently acauired an unplanned fish so I needed a cheap filter for a 10 gallon fish tank quick. I also wanted one that was relatively quiet. This one was the cheapest and it had relatively good reviews, so I decided to try it, and I'm glad I did! After plugging it in, it made noise for a few seconds, but then went completely silent. It took only a few minutes more to clear up the water. Finally, the water flow was strong enough to circulate the whole tank without being so strong it pushed the fish around. I would recommend. Standard pen shown for size ... show more
Reviewed in the United States on September 18, 2017 by Jill Jill

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