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Fluval FX6 High Performance Aquarium Filter, Canister Filter for Aquariums up to 400 Gal.

4.6 4.6 out of 5 stars 5,060 ratings

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FX6

Purchase options and add-ons

  • Multi-stage filter pumps out 925 US Gal (3,500 L) of water per hour, Smart Pump advanced microchip technology continuously monitors and optimizes pump performance
  • Self-starting – just add water, plug in and Smart Pump will take over, trapped air auto-evacuated every 12 hours to ensure maximum efficiency
  • Easy water changes eliminate need to lift heavy buckets. Simply attach hosing to output and Smart Pump does the rest
  • Removable, stackable media baskets eliminate water bypass and hold a total of 1.5 US Gal (5.9 L) of media, all filter media included - mechanical, chemical and biological
  • Compact 21 in (53 cm) tall design - easily fits under most aquariums

Customer ratings by feature

Sheerness
4.5 4.5
Noise level
4.4 4.4
Suction power
4.4 4.4
Value for money
4.4 4.4

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Fluval FX6 High Performance Aquarium Filter, Canister Filter for Aquariums up to 400 Gal.
Fluval FX6 High Performance Aquarium Filter, Canister Filter for Aquariums up to 400 Gal.
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Price$369.99$277.19$288.89$36.83-9% $499.99
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$189.99
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Customer Ratings
Noise level
4.4
4.4
4.8
4.5
4.5
Suction power
4.4
4.5
4.1
4.5
4.5
Easy to clean
4.3
3.6
3.7
4.4
Value for money
4.4
4.3
4.0
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From the manufacturer

Fluval Canister Filter, FX6 Filter (400 Gal)

Designed for aquariums up to 400 gallons, FX6 is the high-capacity workhorse of Fluval’s canister lineup, enhanced with all the power and reliability you’ve come to expect from a high-performance filter.

  • Multi-stage filter pumps out an astounding 925 gallons (3500 L) of water per hour
  • Smart Pump – advanced microchip technology continuously monitors and optimizes pump performance
  • Self-starting – just add water, plug in and Smart Pump will take over. Trapped air auto-evacuated every 12 hours to ensure maximum efficiency
  • Easy water changes eliminate need to lift heavy buckets. Simply attach hosing to output (Kit sold separately) and Smart Pump does the rest
  • Removable, stackable media baskets eliminate water bypass and hold a total of 1.5 gallons (5.9 L) of media

Features:

  • All filter media included – mechanical, chemical and biological
  • Aqua-Stop valves with leak-proof Click-Fit attachment system
  • Valves positioned at convenient 45-degree angle for easy installation and rotation
  • Anti-clog, telescopic strainer ensures continuous water flow
  • Multi-Directional Output nozzles can be fully adjusted to create customized water flows
  • Purge Valve with drain hose for easy maintenance and flushing of canister
  • Rubberized feet help ensure quiet operation
  • 21″ tall design – easily fits under most aquariums
  • For use in freshwater and saltwater aquariums

Product guides and documents

Looking for specific info?

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Language ‏ : ‎ English
  • Product Dimensions ‏ : ‎ 15.1 x 15.6 x 20.7 inches; 19.9 Pounds
  • Item model number ‏ : ‎ A219
  • Date First Available ‏ : ‎ February 23, 2013
  • Manufacturer ‏ : ‎ Rolf C. Hagen (USA) Corp.
  • ASIN ‏ : ‎ B00BJQ50HC
  • Country of Origin ‏ : ‎ Italy
  • Customer Reviews:
    4.6 4.6 out of 5 stars 5,060 ratings

Product Description

Fluval FX6 is a high performance canister filter with many outstanding features designed to make aquarium fish keeping easier and more convenient than ever. This super capacity yet compact canister filter has a pump output of 925 gallons of water and has a filter circulation of 563 GPH, which both work to produce cleaner and healthier results. Filtering material can easily be placed in a removable stack of media baskets, which is at the heart of Fluval's multistage filtration. The baskets are precision-engineered to eliminate water by-pass, making filtration more efficient. The baskets can hold a total of 1.5 gallons of media and can be stacked in the precise combination of layers that will work best for your aquarium. Each one is lined with a foam insert for effective mechanical pre-filtering. Instant-release T-handles let you lift and separate the baskets quickly and easily, making routine maintenance simple. FX6 also features Smart Pump Technology, which provides optimum filter performance. This advanced technological feature employs an electronic circuit board that continuously monitors the pump. Impeller speed and force are constantly measured to ensure power output and energy efficiency. It also manages the filter's self-starting feature and evacuates air that may enter or build up within the filtration system. On a 12-hour cycle, the pump will pause and allow trapped air to escape, ensuring the best filtration efficiency. Only 21" in height, FX6 fits under most aquariums. Fluval first broke onto the aquatic scene in 1975 by introducing the world’s first 3-stage filter with synchronous motor technology. Since then, Fluval has built a legacy around this pioneering spirit, relentlessly adapting in a changing world to launch innovative aquarium products. Fluval’s mission is not just about building products that mimic the natural world, but inspiring aquarists of all skill levels to enjoy and respect the hobby for generations to come.

Important information

Directions

See included instruction manual

Customer reviews

4.6 out of 5 stars
4.6 out of 5
5,060 global ratings

Customers say

Customers like the ease of cleaning, filter, noise and quality of the pet supplies. For example, they mention it's a cinch to clean, the motor runs completely silent and that it works well to keep the tank crystal clear. They appreciate ease of assembly, clarity, and appearance. That said, opinions are mixed on value.

AI-generated from the text of customer reviews

315 customers mention223 positive92 negative

Customers like the quality of the pet supplies. They mention that it works well to keep their tank crystal clear, is powerful enough to suck the waste off the bottom, and is reliable. Some say that the filters are well made and easy to operate shutoff valves.

"...That's it.The performance is amazing - the modular design of bucket within bucket allows for a huge amount of volume in a fairly compact..." Read more

"...3. Starts instantly and runs like a dream.4. Reliable - I've been running an FX5 continuously for 7 years; and an FX6 for 5 years...." Read more

"...The hoses are beefy and very stiff, which is the only troubling issue that I'm dealing with...." Read more

"...The fx5 is very good, best filter I have owned.Flow rate is important, but also is volume. These fx6/fx4 are huge...." Read more

191 customers mention175 positive16 negative

Customers are satisfied with the filter. They mention that it is one of the best filters on the market, reliable, and quiet. Some say that Fluval makes the best filter, absolutely silent when properly maintained. Overall, customers are happy with their purchase and recommend it to others.

"...it was going to be too much filter for the tank, I was wrong, it's a great size...." Read more

"...It's well built, has lots of room for media and bio foam; and is surprisingly easy to maintenance...." Read more

"...2. Moves a lot of water, and keeps the tank sparkling.3. Starts instantly and runs like a dream.4...." Read more

"...The fx5 is very good, best filter I have owned.Flow rate is important, but also is volume. These fx6/fx4 are huge...." Read more

185 customers mention161 positive24 negative

Customers like the noise level of the pet supplies. They mention that the motor runs completely silent and is nearly vibration free.

"...Then when you put it back together, the smart pump is not only quiet but it also makes super easy to prime - just plug it in. That's it...." Read more

"...Very quietGood flow through aquarium... can be a negativeI use mine on a 75g tank, and a sand substrate...." Read more

"...At some point I realized that the filter WAS running and is just whisper quiet. I mean unbelievably quiet for the size of the thing...." Read more

"It’s super quiet, and keeps the water clean. I have a RES turtle in a 75 gallon" Read more

152 customers mention127 positive25 negative

Customers find the filter easy to set up and to prime. They say the instructions are great and the filter is fast to set-up. Customers also mention that the filter has a self-priming solution and runs gracefully.

"...together, the smart pump is not only quiet but it also makes super easy to prime - just plug it in. That's it...." Read more

"...After those experiences, the FX5/6 were such a joy. They're simple to assemble, and they prime immediately...." Read more

"...(no where near as good as the older Magnums, but very easy to service)...." Read more

"...Instructions are great if you have a small glass aquarium with straight sides. But then why then would you need this moose of a filter?..." Read more

132 customers mention109 positive23 negative

Customers like the ease of cleaning the filter. They say it keeps their aquarium perfectly clean, helps reduce frequency of cleaning, and is easy to use and clean. Customers also mention that the motor and impeller are relatively easy to remove and clean, and the water remained pure clean for over 2 months.

"...No poop water splashing everywhere, no mess. It's a great design...." Read more

"...Keeps the tank sparkling clean, Ammonia/nitrites at zero, and Nitrates are 10ppm after a couple months of use..." Read more

"It’s super quiet, and keeps the water clean. I have a RES turtle in a 75 gallon" Read more

"...My tank is looking cleaner and better than ever...." Read more

101 customers mention96 positive5 negative

Customers are satisfied with the clarity of the water in their aquarium after using the FX6 filter and pump. They mention that the water looks crystal clear and is spectacular.

"...full, how I did it still not sure, but when it happened, outflow was nice and steady...." Read more

"...I use mine on a 75g tank, and a sand substrate. The flow is so nice that all the detritus ends up in the canister, and I never have to gravel vac..." Read more

"...The next morning (about 14 hours) it was crystal clear. I cannot take my eyes off it. The tank is beautiful...." Read more

"I have a 130 gallon fish tank and the water is so clear it looks like glass. Best filter I have ever brought...." Read more

50 customers mention41 positive9 negative

Customers like the appearance of the pet supplies. They mention it looks good, has a better design, and is a much more elegant solution compared to fiddling around with a siphon. They also appreciate the media trays and the tank mounts for the hoses. Overall, customers are happy with their purchase and recommend it to others.

"...No poop water splashing everywhere, no mess. It's a great design...." Read more

"...cichlids for 15 years, I like the Malawi Mbuna because they are colorful and easy to keep but they do produce a large amount of detritus and are..." Read more

"...The directions are quite clear and very specific with plenty of illustrations...." Read more

"...Will see how it works once I put the fish. Over all product looks good and solid. It's made with plastic but is quite sturdy...." Read more

114 customers mention67 positive47 negative

Customers are mixed about the value of the filter. Some mention that it's worth the price, and will save them money on fish. However, others say that it is a bit pricey and awfully spendy for a plastic piece.

"...This filter is definitely worth the money, you shouldn't be disappointed." Read more

"...6. Expensive. It just is. That's a lot of money to drop on a filter. But I think it's well spent...." Read more

"...As we know, turtles are very dirty, this filter is phenomenal. So worth the money. My previous filter was a Flavill 307 which also was great...." Read more

"...However, there is a lot to love about the Fluval FX6. The price is much cheaper...." Read more

Fluval FX6
5 Stars
Fluval FX6
This filter is amazing! I use this filter for turtles. As we know, turtles are very dirty, this filter is phenomenal. So worth the money. My previous filter was a Flavill 307 which also was great. But this just amazing job.My turtles only spend half the season inside the house. The other half outside. which means I will probably not have to change this filter until it’s time to put them outdoors in the spring!This filter is quite large, I will have to rearrange my tank area set up. But so worth it!The ease of putting this together was great. My favorite part is it primes itself! This was half the battle with my other Fluval.
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Reviewed in the United States on May 11, 2023
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Reviewed in the United States on June 14, 2018
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5.0 out of 5 stars Moves a lot of water; Rock-solid construction.
Reviewed in the United States on June 14, 2018
I bought an FX5 in 2011. Seven years later it is still running like brand-new.
I bought an FX6 in 2013. Five years later . . . .like brand new.

I've been keeping fish for more than 25 years. During that time I've used many different types of canister and HOB filters. My main recollection with previous canisters was the rage and frustration of priming them, fitting finicky rubber gaskets, dozens of fussy parts. . . After those experiences, the FX5/6 were such a joy. They're simple to assemble, and they prime immediately.

Nothing is perfect, so here are pros and cons to help the prospective buyer:

PROS:
1. Huge capacity. Imagine a 4-gallon bucket filled with media, with a powerful motor in the lid.
2. Moves a lot of water, and keeps the tank sparkling.
3. Starts instantly and runs like a dream.
4. Reliable - I've been running an FX5 continuously for 7 years; and an FX6 for 5 years. I've never once had any repair issues or problems of any kind. The only maintenance I do is clean or change the media as needed.

CONS (and these would probably be better described as "things to consider before getting one").

1. Powerful enough to suck up fish. In my 120g, I previously had jewel cichlids. They spawned, and whenever I would clean the filter I would find babies inside. Again, this is not a defect, this is just a cautionary note to be smarter than I was about where you use the filter. I currently have guppies in the 120g. They have hundreds of babies. Again, on any given day I'll find a dozen babies in the filter. (FWIW, you can adjust the flow, although I'd suggest that if you need reduced throughput, you might just get a smaller and cheaper filter).

2. It's heavy and awkward. Hey, it's a 4-gallon-ish bucket filled with water and filter media. It's heavy. As another reviewer noted, I have to heave it out of the cabinet and haul it outside to maintain it.

3. You may need to tinker with the selection and placement of filter media. A Google search will yield multiple hits from people who have suggestions and opinions on the topic. I may still be doing it wrong. From bottom to top I have a water polishing pad, two foam pads, and ceramic tubes. For some reason, the polishing pad gets saturated first, and ends up being the reason for reduced flow, while the others are only somewhat dirty. My tank is moderately planted, and I can go through perhaps 4-5 weeks between filter cleanings/media changes.

4. You'll want a towel when disconnecting the filter from the hoses for cleaning. I have not found a way to keep about half a cup of water from escaping whenever I disconnect.

5. It may take some elbow crease to depress the "buttons" (wrong term) to release the hose from the filter body. You have to depress them and lift the hose off, and sometimes it requires some effort.

6. Expensive. It just is. That's a lot of money to drop on a filter. But I think it's well spent. I imagine you're paying for a powerful and well-built motor. No other piece of aquarium equipment (excluding the tank, of course) has lasted me 7 years - let alone in like-new condition. I feel that I easily have another 7-plus years out of it.

Bottom line? I see no need to look for alternative filters for large tanks. I just bought a 300g aquarium, and when it arrives I will be furnishing it with another FX5 or FX6.
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Sp
5.0 out of 5 stars Works incredibly well, maintenance is a breeze
Reviewed in Canada on March 7, 2024
Rafael ugarte
5.0 out of 5 stars Es un excelente filtro
Reviewed in Mexico on January 30, 2024
Nadya
5.0 out of 5 stars Hallelujah
Reviewed in Canada on December 25, 2023
Helen Moberg
5.0 out of 5 stars Kanon bra filter
Reviewed in Sweden on June 14, 2023
2 people found this helpful
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Vicky
5.0 out of 5 stars Pepino de filtro con un nivel de ruido casi inapreciable.
Reviewed in Spain on March 19, 2023