Editor's Choice - Our Favorite 20 Gallon Aquarium Filters

1. AquaClear, Fish Tank Filter, 5 to 20 Gallons, 110v, A595

User Ratings: 75 6

AquaClear A595 First Impressions

"Its AMAZING."

DO NOT CLEAN OR WASH the paper wheel itself. I've think I've had had six of them. I was worried about some of the negative reviews. The bacteria eats the nitrates in the water to help keep it clean. Replace activated carbon every 6-8 months ish. Oscars are very messy fish, especially during feeding. I've looked at so many filters and reviews.

  • AquaClear, Fish Tank Filter, 5 to 20 Gallons, 110v, A595
  • Aquarium filtration system that offers superior contact time with filter media and energy efficient pump lowers operating costs
  • Quick and easy installation, we recommend that you clean aquarium filter every two weeks for maximum operation and efficiency
  • Provides optimal mechanical, chemical, and biological filtrations
  • Comes equipped with AquaClear Foam, Activated Carbon Filter and BioMax and Cycle Guard for superior water quality
  • Filtration volume is up to 7 times larger than comparable fish tank filters
  • Lifetime warranty; ideal for aquariums up to 20 gallons
  • Manufacture: Rolf C. Hagen (USA) Corp.
  • Product Dimensions: 4.5 x 7 x 6.5 inches; 1.4 Pounds
  • Editor's Impressions Of The AquaClear A595
  • Filter Effectiveness
  • Quality
  • Value For Money
  • Affordability

AquaClear A595 Final Thoughts

"One piece of advice."

My box came in good condition, parts where in tact and new. With the 350's inexpensive price point, you can’t go wrong with this powerful filter. I use Marinelands refillable cartridge for extra carbon on the extra slots. Early on it seems to be working as advertised. That water got so dirty we had to keep changing it every 2 or 3 days. Fill up the media slot with water until it's full. Not sure what I'll do with the more complex design.

Overall Score
4.5


(3199 Points)

Peoples Choice - Other Highly Rated 20 Gallon Aquarium Filters

2. Aqueon QuietFlow LED PRO Aquarium Power Filter 10

User Ratings: 68 7

Aqueon 100106080 First Impressions

"Thats whats☝ up!"

Doing research I learned that if I add more filter media, the noise will subside. I also don't like how short the intake tube is. A canister or in tank filter is ten times more work and messy. All in all, I highly recommend this filter and I'm a extremely happy customer! I had to lower the surface by 3 inches to get sufficient agitation. This filter really does a good job. I thought that U had put it together wrong so I took it all apart and started over.

  • Aqueon QuietFlow LED PRO Aquarium Power Filter 10
  • Provides mechanical, chemical, biological filtration plus additional assistance with the Aqueon specialty filter pads
  • Self-priming – starts up automatically after cleaning or power interruptions.
  • Certified flow rates that assure proper water circulation for improved fish health
  • LED indicator light flashes when it’s time to replace clogged cartridges by monitoring actual water levels.
  • Internal pump design helps dampen noise and eliminate leaks
  • Lifetime warranty; Ideal for aquariums up to 20 gallons
  • Uses medium Aqueon replacement cartridges
  • Manufacture: Central Garden & Pet
  • Item Weight: 1.2 pounds
  • Product Dimensions: 6.4 x 6.3 x 3.8 inches
  • Editor's Impressions Of The Aqueon 100106080
  • Filter Effectiveness
  • Quality
  • Value For Money
  • Affordability

Aqueon 100106080 Final Thoughts

"29 gallons."

LOW and BEHOLD, LMAO, I missed where you had to put water in the back of the filter. I recently upgraded from a 10 gallon aquarium to a 29 gallon. I use Marinelands refillable cartridge for extra carbon on the extra slots. LOW and BEHOLD, LMAO, I missed where you had to put water in the back of the filter. I still have my original wheels on the year old 350 with no issues whatsoever. SO, I sat down and read EVERY little thing in rhe instructions. I DONT KNOW WHY MANY THINK THIS IS A NOISY FILTER.

Overall Score
4.3


(1345 Points)

3. HITOP Submersible Aquarium Internal Filter, Adjustable Underwater Filter, Corner Filter with Water P...

User Ratings: 44 18

HITOP HP-118 First Impressions

"Not ideal but it works."

This new AQ50 filter has loose bio-media, i. My tank was a mess when I got this pump. A canister or in tank filter is ten times more work and messy. Oscars are very messy fish, especially during feeding. Also the maker should review the pump design. I was worried that it might be too much for my aquarium or that it would be loud. Lightly clean the silver roller pins on the ends.

  • HITOP Submersible Aquarium Internal Filter, Adjustable Underwater Filter, Corner Filter with Water Pump for Fish Tank up to 20 Gallon
  • 3W Internal Filter: This aquarium filter quietly delivers 55 gallons per hour of crystal-clear water for your lovely fish, suitable for fresh or marine aquarium, perfect for 5 to 20 gallons, ideal choice for aquarium or turtle/aquatic reptiles use.
  • Adjustable 55 GPH Water Pump, pump head with adjustable and directional water flow, spray bar option allows you to distribute water evenly helping aerate your tank.
  • Space saving corner filter design, 5.7 x 1.6 x 2.4 in / 14.5 x 4 x 6cm, fish tank filter can be placed horizontally and easily hidden.
  • Multiple filter media, the filter with multiple filter media for all filtration purposes. Your lovely fish or turtle will have a clean and fresh environment for living.
  • Warranty: Offer 12 months warranty, leaves no worries for your purchase.
  • Manufacture: Haisen
  • Editor's Impressions Of The HITOP HP-118
  • Filter Effectiveness
  • Quality
  • Value For Money
  • Affordability

HITOP HP-118 Final Thoughts

"Turtle tank."

I contacted Marineland about my issue and they promptly sent me a new one right away! Overall I would recommend this item. They can be very noisy at the impeller, which sometimes quiets in time, but may not. I also don't like how short the intake tube is. They can be very noisy at the impeller, which sometimes quiets in time, but may not. Doing research I learned that if I add more filter media, the noise will subside. I have always used Marineland filters and been happy with them and their quality.

Overall Score
3.6


(291 Points)

4. Aqueon Aquarium Filter Kit w/Media (4 Month Supply), Up to 20 Gallons

User Ratings: 81 2

Aqueon 100540434 First Impressions

"My fault not theirs."

SO I decided to order this for my 29 gallon tank. You can't really tell though, and the filter is working great. A canister or in tank filter is ten times more work and messy. So, easy is good, both for us and our fish. This one is working perfectly good FOR RIGHT NOW. It doesn't rise up hugely above the tank like a lot of HOB filters. I want to answer some of the complaints I've read.

  • Aqueon Aquarium Filter Kit w/Media (4 Month Supply), Up to 20 Gallons
  • Value pack includes: Aqueon Quietflow 10 filter, 4 Medium filter cartridges, 5 ammonia pads and water Conditioner sampler
  • Five stage filtration: mechanical, chemical, biological, and an additional specialty pad for the cleanest, clearest, healthiest water
  • Recommended for aquariums up to 20 gallons
  • Self-priming - starts up automatically after cleaning or power interruptions
  • High flow rates ensure a highly dissolved oxygen content or healthier, more active fish
  • Manufacture: Central Garden & Pet
  • Product Dimensions: 8.75 x 6.5 x 8.25 inches; 1.53 Pounds
  • Editor's Impressions Of The Aqueon 100540434
  • Filter Effectiveness
  • Quality
  • Value For Money
  • Affordability

Aqueon 100540434 Final Thoughts

"I should loosen it up."

Typically just below the flat part of the outlets. I still have my original wheels on the year old 350 with no issues whatsoever. Now I'm having the same issue with the Aqua Clear 50. I put it together, reading instructions of course. That water got so dirty we had to keep changing it every 2 or 3 days. Following morning it was running quietly. Fill it up with water before you plug it in.

Overall Score
4.6


(220 Points)

Honorable Mentions - More Top Selling 20 Gallon Aquarium Filters

5. Flexzion Aquarium Internal Filter Submersible 3-in-1 Multi-Function Mini Pump for Fish Tank with Adj...

User Ratings: 48 14

Flexzion First Impressions

"I should loosen it up."

I'm a mechanical engineer and understand design. I AM IMPRESSED THAT IT WORKS AS IT ACTUALLY SHOULD! In the afternoon the noises started again. One thing I think is worth mentioning is the need to prime the filter. Lift the sticking wheel outuse a Q-tip to clean the slots where the wheel rests. Lightly clean the silver roller pins on the ends. I'm currently in the process of receiving another replacement on that model.

  • Flexzion Aquarium Internal Filter Submersible 3-in-1 Multi-Function Mini Pump for Fish Tank with Adjustable Flow Rate + Spray Bar + Pipe
  • Fits tank size up to 20 gallon
  • Compact power filter with adjustable flow rate
  • Integrated spray bar creates an even flow of water
  • Direct flow diffuser for greater surface agitation
  • Suitable for both freshwater, saltwater and pond use
  • Manufacture: Flexzion
  • Product Dimensions: 8 x 4 x 3 inches; 9.17 Ounces
  • Editor's Impressions Of The Flexzion
  • Filter Effectiveness
  • Quality
  • Value For Money
  • Affordability

Flexzion Final Thoughts

"It was an Awesome filter!"

I used to have a 37 gallon eclipse aquarium. I have always used Marineland filters and been happy with them and their quality. Lightly clean the silver roller pins on the ends. My old pump was not working very well so I had to make a major clean up. I want to answer some of the complaints I've read. The Marineland penguin 350 is a great filter. It sounds like a Big Air pump buzzing.

Overall Score
3.8


(168 Points)

6. QuietFlow Aqueon 10 LED Pro Power Filter (Item #06080)

User Ratings: 62 7

QuietFlow 11264186 First Impressions

"Huge capacity."

This filter comes with a sponge, activated carbon, and bio material in a mesh bag. What I don't like is how much smaller it is than the Aqueon. My baby turtle even loves it so much he won't let go. I was worried about some of the negative reviews. It sounds like a Big Air pump buzzing. This filter really does a good job. I can hear it 3 rooms away grinding away.

  • QuietFlow Aqueon 10 LED Pro Power Filter (Item #06080)
  • The Aqueon QuietFlow 10 LED Pro Power Filter feature four stages of filtration–mechanical, chemical, biological and wet/dry–for the cleanest, clearest, healthiest water. Higher flow rates ensure higher dissolved oxygen content for healthier, more active fish
  • The internal pump design helps dampen noise, eliminates leaks and starts up automatically after cleaning or power interruptions
  • For fresh & saltwater aquariums up to 20 gallons
  • Manufacture: Aqueon
  • Editor's Impressions Of The QuietFlow 11264186
  • Filter Effectiveness
  • Quality
  • Value For Money
  • Affordability

QuietFlow 11264186 Final Thoughts

"In one day crystal clear."

I'm a mechanical engineer and understand design. A canister or in tank filter is ten times more work and messy. I decided to go with this filter since I had a positive experience previously. I sent a request for replacement and one came the next day. The first night I had the pump going it started making a screeching sound. The first night I had the pump going it started making a screeching sound. Marineland bio pumps have been around forever.

Overall Score
4.3


(149 Points)

7. Penn-Plax 455 Cascade Corner Filter

User Ratings: 50 10

Penn-Plax 07193 First Impressions

"Will UPDATE!"

Basically, make sure everything that is suppose to spin, does so smoothly. It's only rated at 25 gph less, but holds considerably less media. Your fish and you will be much happier and stun everyone else. First they are simple and designed to pump and filter aquarium water. Also price was very reasonable and shipping was fast. Once it loses its charge, you'll need to replace it. I eyedball everything and put it together with a look back at instructions.

  • Penn-Plax 455 Cascade Corner Filter
  • Space saving corner design
  • Fully submersible filter quietly delivers 120 gallons per hour of crystal clear water for your fresh or marine aquarium up to 20 gallons in size
  • Spray bar option allows you to distribute water evenly helping aerate your tank
  • Can be placed horizontally and is easily hidden
  • Manufacture: Penn Plax
  • Product Dimensions: 5 x 2 x 11 inches; 1.1 Pounds
  • Editor's Impressions Of The Penn-Plax 07193
  • Filter Effectiveness
  • Quality
  • Value For Money
  • Affordability

Penn-Plax 07193 Final Thoughts

"Disappointing."

It wasn't producing much surface agitation. I contacted Marineland about my issue and they promptly sent me a new one right away! I ordered 4 of these, for different tanks of course. I was worried about some of the negative reviews. There is a sound from the water shooting into the tank! The Marineland penguin 350 is a great filter. I put it together, reading instructions of course.

Overall Score
4.0


(112 Points)

8. AQUA-TECH Power Aquarium Filter, 10 to 20-Gallon Aquariums

User Ratings: 62 10

AQUA-TECH ML90738-00 First Impressions

"It's priced awesome!"

I was worried about some of the negative reviews. I ordered 4 of these, for different tanks of course. Typically just below the flat part of the outlets. It's only rated at 25 gph less, but holds considerably less media. If that does not work, look into silicone grease so you can lube the impeller. Following morning it was running quietly. This is a good choice if you're tired of cleaning your turtle tank all the time.

  • AQUA-TECH Power Aquarium Filter, 10 to 20-Gallon Aquariums
  • For 10 to 20 gallon aquariums
  • Two year warranty
  • Advanced 3 step filtration
  • Comes with one AQUA-Tech EZ-Change #2 Filter Cartridge
  • Traps dirt, removes impurities and offers maximum water to carbon contact
  • Manufacture: Aqua-Tech
  • Product Dimensions: 4.31 x 9.25 x 8.5 inches; 1.55 Pounds
  • Editor's Impressions Of The AQUA-TECH ML90738-00
  • Filter Effectiveness
  • Quality
  • Value For Money
  • Affordability

AQUA-TECH ML90738-00 Final Thoughts

"Just a low hum."

I was worried that it might be too much for my aquarium or that it would be loud. I have always used Marineland filters and been happy with them and their quality. Fill up the media slot with water until it's full. Typically just below the flat part of the outlets. My box came in good condition, parts where in tact and new. I ordered 4 of these, for different tanks of course. SO, I sat down and read EVERY little thing in rhe instructions.

Overall Score
4.2


(68 Points)

9. Aqueon 100534682 QuietFlow Internal Shrimp Filter for Freshwater Aquariums up to 20 Gallons, Size 20...

User Ratings: 65 9

Aqueon 100534682 First Impressions

"Not ideal but it works."

Overall, I like the 350's slim back design, and be able to add up to 4 cartridges. Following morning it was running quietly. Works like a dream and can't even hear it! Firstly, I'd recommend taking the motor apart and putting it back together. You do have to unplug it for those two jobs. I was worried about some of the negative reviews. I used a small pair of pliers and carefully got the pebbles out.

  • Aqueon 100534682 QuietFlow Internal Shrimp Filter for Freshwater Aquariums up to 20 Gallons, Size 20, Black
  • Internal filter for freshwater tanks up to 20 gallons
  • Intake grid and pre-filter sponge protect shrimp and small fish
  • Preloaded with a replaceable carbon cartridge for chemical filtration
  • Comes with hooks and suction cups for use with either traditional or frameless aquariums
  • Aqueon QuietFlow Internal Shrimp Filter is recommended for small freshwater tanks containing ghost, amaro, cherry, crystal and bee, or bamboo shrimp
  • Included Components: All Items As Per Description, Age Range Description: All Life Stages
  • Manufacture: AQUEON
  • Product Dimensions: 5.5 x 4.5 x 8 inches; 1.25 Pounds
  • Editor's Impressions Of The Aqueon 100534682
  • Filter Effectiveness
  • Quality
  • Value For Money
  • Affordability

Aqueon 100534682 Final Thoughts

"Very pleased!"

That water got so dirty we had to keep changing it every 2 or 3 days. Basically, make sure everything that is suppose to spin, does so smoothly. I was worried that it might be too much for my aquarium or that it would be loud. I had to lower the surface by 3 inches to get sufficient agitation. I DONT KNOW WHY MANY THINK THIS IS A NOISY FILTER. My tank was a mess when I got this pump. I stopped the pump and I pulled it apart.

Overall Score
4.1


(10 Points)

10. Whisper IQ Power Filter for Aquariums, With Quiet Technology

User Ratings: 69 5

Tetra 78003 First Impressions

"Its AMAZING."

I returned the Aqua Clear 70 and promptly received a replacement. It wasn't producing much surface agitation. Basically, make sure everything that is suppose to spin, does so smoothly. My tank is nice and clear and my fish are much happier. LOW and BEHOLD, LMAO, I missed where you had to put water in the back of the filter. I have 4 other AquaClear filters and like them. Clean the foam insert apparently it pulled a lot of dirt and needs cleaned.

  • Whisper IQ Power Filter for Aquariums, With Quiet Technology
  • QUIET aquarium FILTER: The Tetra Whisper IQ Power Filter with Stay Clean technology contains a sound shield for quiet filtration less than 40 dB.
  • SELF PRIMING: Submerged motor starts up with no priming required.
  • STAY CLEAN TECHNOLOGY: By maintaining healthy pH levels, creates easier maintenance for healthier fish.
  • CARTRIDGE REFILLS: Change cartridges monthly; uses large-sized Tetra Whisper Bio-Bag Filter Cartridges (refills sold separately).
  • Manufacture: Tetra
  • Product Dimensions: 7 x 6.25 x 8.75 inches; 2 Pounds
  • Editor's Impressions Of The Tetra 78003
  • Filter Effectiveness
  • Quality
  • Value For Money
  • Affordability

Tetra 78003 Final Thoughts

"Its AMAZING."

I was also having oxygen issues because of this. Following morning it was running quietly. BUT after some YouTube research I was able to fix the noise issue. Also price was very reasonable and shipping was fast. I used a small pair of pliers and carefully got the pebbles out. They are easily found from mom-n-pop pet stores to large chain stores. It started out silent for about 30 mins and then it got super loud.

Overall Score
4.4


(1985 Points)

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