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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

  • Based on 545 reviews
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Availability: Only 5 left in stock, order soon!
Fulfilled by Amazon

Arrives Aug 7 – Aug 8
Order within 5 hours and 34 minutes
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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 infant 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: #11,146 in Pet Supplies (See Top 100 in Pet Supplies) #155 in Aquarium Filter Accessories


#155 in Aquarium Filter Accessories:


Customer Reviews: 4.2 4.2 out of 5 stars 545 ratings


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: Aug 7 – Aug 8

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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Top Amazon Reviews


  • small, silent, cheap, effective, easy to understand instructions. I'm a fan!
Size: 55 to 100 Gallons
I am so impressed with this filter! Let's just start with the fact that the instructions were well written by someone who is (I would guess) a native English speaker. I put the filter into a very, very murky tank. It had been murky for a long time. Within two days of installing this filter, the water really was clear. The filter is smaller and cheaper than many of the other filters I have used for big tanks, and the aeration option is nice too (the aeration does make some noise, though.) I am genuinely impressed! ... show more
Reviewed in the United States on June 6, 2025 by G

  • Must have!!!
Size: 55 to 100 Gallons
I am SO pleased with this filter. I’ve had aquariums for 30+ years and this is the best filter I’ve found. Easy to assemble. Quiet. The water in the tank doesn’t evaporate as quickly as with an above water filter. This is a particular must have for eel owners. My zig zag eel was an escape artist (typical eel behavior) and would constantly swim into above water filter. That problem is now gone. Filter has been installed for a little over a month and no issues When I received this item from Amazon it was missing a couple of pieces. I reached out to the company via email and they immediate replied and sent out a replacement. ... show more
Reviewed in the United States on July 11, 2025 by Jennifer Ohlson

  • Two sizes in one product!
Size: 20 to 55 Gallons
Easy to put together, you have one item that have two size options. Make sure to read the instructions. If you put all the pieces togethers it will make a 11 inch tall filter, but if you just put one of the filters you have a smaller version that it will be 8 inches tall for a smaller tank. You never will never have to change sponges again. Excellent product and very quiet. Worth the money ! ... show more
Reviewed in the United States on July 31, 2025 by Anya's

  • Filter replaced and working
Size: 55 to 100 Gallons
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. ... show more
Reviewed in the United States on May 15, 2025 by Amazon Customer

  • Impossible To Unassemble And Dirty Water
Size: 20 to 55 Gallons
For context, I’ve had aquariums the last 15 years. Currently I have a 20 gallon aquarium with ONE goldfish. Medium size. I was tired of tetra filters and the constat expense, so I decide to get this one to avoid those expensive charcoal filters, and just have the sponge filter this one offers ( quite tiny ) and the bio balls which promised crystal clear water. None of the above happened. The water was dirty in 5 days, it turned green, the lack of charcoal in this filter was part of the problem. Which I added later independently in mesh bags ( and this alone kept the water impeccable for days ) But what I dislike the most about this filter is the UNASSEMBLE PROCESS, Is impossible, frustrating, hard to do. You almost break the parts in many attempts to unassemble in order to clean it. To top it off, two months after purchase, it stops working, out of the blue, it stops with the oxigen and I had to take it out, see what’s wrong, inmerse, repeat, unassemble, and on my 10th attempt it just started working again. I don’t like to ruin anyone’s business, but this is the last filter I would recommend out of the filters I’ve tried. Buy mesh bags, fill them with enough charcoal, rinse, inmerse, get a simple sponge filter, EASY to unassemble and VOILA! perfect clean water for up to 3 weeks. ... show more
Reviewed in the United States on April 16, 2024 by Carolina DH

  • Tank Pump
Size: 55 to 100 Gallons
Filters and aerates the water effectively. Filters are easy to clean and reassemble. No problems.
Reviewed in the United States on July 29, 2025 by VR

  • Best filter ever !
Size: 20 to 55 Gallons
This filter is absolutely amazing! I was having trouble with my tank staying clear and keeping my levels where they should be. As soon as I put this filter in, my tank was crystal clear within the first hour! My tank and fish are now thriving! I would highly recommend!
Reviewed in the United States on July 31, 2025 by alyshia

  • so quite
Size: 20 to 55 Gallons
Legit, easy to clean and SILENT! no more waterfall in the office
Reviewed in the United States on July 24, 2025 by joey

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