20 Gallon Fish Tank Filter up to 55 Gallons | Quiet Fish Tank Filter | Crystal Clear Water | Turtle Tank Filter | Submersible Aquarium Filter, Filter for Fish Tank, 50 Gallon Fish Tank Filter
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Availability:
Only 5 left in stock, order soon!
Arrives
Wednesday, May 13
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Size: 20 to 55 Gallons
Features
- CRYSTAL CLEAR WATER Unlike other fish tank filters on the market, the Atlantis Aqua submersible aquarium filter draws water through the bottom of the filter, rather than the sides. This means the water travels through the full fish filters system rather than taking the easiest path and being partially filtered, like other fish filters.
- NO NEED TO CHANGE FILTER PADS The filter sponges last a lifetime, so no need for expensive monthly replacements! Can be used as a Turtle Filter. Detachable sections so it can be used as a fish tank filters 20 gallon - 55 gallons and can be used in a goldfish, tropical or saltwater tank.
- HEALTHIER FISH The internal aquarium filter oxygenates the water which is vital to the health of your pets - they also enjoy swimming in the waves!
- ALL-IN-ONE FILTRATION SYSTEM Our aquarium filter includes a sponge filter and a biological filter. The filter is 11.4" tall and 2.75" wide but it can be used with one section removed and is 7.6" tall.
- MANCHESTER BASED DESIGNER We are a Manchester based company that is passionate about providing high quality products whilst offering the best customer service. All of our products come with a 1-year warranty. This filter is not suitable for small shrimp or small fish.
Package Dimensions : 11.81 x 4.84 x 3.58 inches; 2.07 Pounds
Item model number : Aqua-100
Date First Available : December 26, 2022
Manufacturer : Atlantis Aqua
Best Sellers Rank: #51,103 in Pet Supplies (See Top 100 in Pet Supplies) #739 in Aquarium Filter Accessories
#739 in Aquarium Filter Accessories:
Customer Reviews: 4.2 4.2 out of 5 stars (871)
Item Weight: 2.07 pounds
Manufacturer: Atlantis Aqua
Item model number: Aqua-100
Date First Available: December 26, 2022
Item Package Dimensions L x W x H: 11.81 x 4.84 x 3.58 inches
Brand Name: Atlantis Aqua
Target Audience Keyword: fish
Directions: Add the submersible aquarium filter into the fish tank before plugging in. The fish filter is suitable for 20 gallon fish tanks, 40 gallon, 50 gallon, and every size up to 100 gallon tanks. The filter is sealed on the sides which forces the water through the bottom of the filter resulting in crystal clear water.
Warranty Description: 1 year
Model Name: Aqua-55
Color: Black
Size: 20 to 55 Gallons
Age Range Description: All Life Stages
Included Components: Filter, Filter Sponges, Filter Bio-Balls and Manual
Specific Uses for Product: Active
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, May 13
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 20 to 55 Gallons
Better Performance than Stock Filters I purchased this to replace the original filter that came with my Top Fin 29-gallon tank. It has done a significantly better job of keeping the water crystal clear compared to the old filters that were constantly needing replacement. Easy Setup & Transition Fish-Safe Transition: Following the instructions, I kept both the old and new filters running for a week to help the fish transition smoothly. Built-in Aeration: I love that the bubbles are built-in. It allowed me to remove my separate air stone/bubbler, making the tank look much cleaner and less cluttered. Maintenance The maintenance is incredibly simple and cost-effective. Instead of buying expensive cartridges, I just follow the instructions to clean the sponges twice a month. It’s very easy to manage. The Verdict This is a quiet, powerful, and efficient Submersible Aquarium Filter. It’s an excellent choice for anyone looking to upgrade a standard kit filter to something more robust and easier to maintain.
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Reviewed in the United States on February 8, 2026 by Shelly
I've had this for several months in my well planted aquarium. It's small, easy to maintain, and very good at maintaining excellent water quality. My biggest complaint is it's very difficult to separate the sections to replace filter products. It's actually a real bitch trying to separate the parts. There must be a trick I can't figure out. However, my tank is so nice and clear. I only have to do heavy maintenance in about six weeks of operation. The unit is quiet, and effective. Go ahead with this one! Just remember to put on your patience hat when maintaining it.
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Reviewed in the United States on April 17, 2026 by Anne
The media could not be loaded. I upgraded to this filter because I needed more power and filtration, and it works great. This filter moves some serious water and keeps the holding tank clean. It has a customizable oxygen aerator which is super helpful. My tank is about 15 gallons and it's able to keep it clean without trying very hard. The design is well thought out, you just unclick the sections, rinse out the filter sponges with tank water and reinstall. It comes with bio balls that install easily. It is about 13" tall and you can remove a section of filtration if you don't need as much (I got the 55-100 gallon filter). It is pretty quiet unless you are using a lot of oxygenation. You never need to replace filters in this which is highly convenient and why I went with this model. Overall I've used it for a few weeks now and I'm impressed. I'd recommend it if you want a simple, clean filter that doesn't require much work after the fact and looks nice.
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Reviewed in the United States on December 30, 2025 by Nicholas
UPDATE: Customer service reached out to me to inquire about what specifically was wrong with my unit. I was having issues with the propeller. A replacement filter was provided and so far working great. I appreciate the quick response as my turtle is extra messy this time of year. I will update if anything changes, though I feel fairly confident it will keep working this time. ORIGINAL: I was originally impressed with the filter. Was pretty quiet and easy to put together. I cleaned it and saw that it had caught a lot. However, it has stopped working since its first cleaning. This isn't my first filter. I try to be careful when cleaning. Not sure why it stopped working. But now my tank is dirty again so quickly and I'm filterless.
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Reviewed in the United States on May 15, 2025 by Amazon Customer
Size: 20 to 55 Gallons
I’ve had this filter for three years in a 10, 20, and now 40gal tank. I loove the fact that the pieces come apart so I was able to fit it in the two smaller tanks and bonus, it still works when it’s lying down. It is 100% silent. It was a tad too powerful when my turtle was a baby so I hid it behind a large cave and it worked just fine. I’ve got a red eared slider and they are so messy iykyk this filter has always kept up and works quick. I just recently upgraded my tank size. First pic was when I went to bed second pic was when I woke up. The listing says 20-55 gal but the box says it goes to 100 which is great because you should always get a filter that does more than your tank holds. The fact that this filter has gone in three different tanks, has moved with me through 5 apartments, and three years show it’s really stood the test of time. And it’s so easy to clean you just rinse it. Just make sure your tank is tall enough to be fully submerged
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Reviewed in the United States on April 11, 2026 by Katelyn Little
Size: 20 to 55 Gallons
I DO NOT recommended this product. Although I appreciated the aeration feature, I think that this is an overall hack job of a filter. It simply DOES NOT clean the water properly. I can easily echo what other ppl with negative feedback have experienced. I liked the idea of reusable media and sponges (vs. creating more landfill) but it appears as the the product works okay for about a month or so, it then all of a sudden drops off in performance and the motor parts begin to fail if work at all anymore! The product doesn't do well filtering or even retaining waste in the sponges (in retrospect, i feel that a design flaw lies in the almost entirely sealed chambers of plastic, especially on the bottom, which is capped where you would expect there to be small open spaces for waste to be sucked in from the bottomofyouraquariu). Although the product comes with a warranty card that I scanned onto my phone and put my email and info into I never received an email or a link to reference regarding warranty information or how to proceed on refunds or replacement or whatever! I literally had to bite the bullet and go buy another product on a whim and replace this P.OS. because my nitrates were suddenly spiking and my fish were starting to experience illness because of apparent product failure. I went ahead and got a Fluval AC30, which I know is a completely different set-up but its incredibly quiet and is also media-based vs. cartridge-based, as I am concerned about environmental as well as financial impacts over time. Hope this is helpful.
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Reviewed in the United States on December 14, 2025 by Isaac L.