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Fluval

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

  • Based on 3,431 reviews
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Size: FX6


Features

  • 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

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.

Brand: Fluval


Color: Black


Material: Rubber


Style: FX6 Filter


Product Dimensions: 20.87"L x 15.75"W x 15.75"H


Power Source: Corded Electric


Item Weight: 19.9 pounds


Maximum Flow Rate: 3500 liters per hour


Maximum Lifting Height: 21 inches


Horsepower: 41


Language ‏ : ‎ English


Product Dimensions ‏ : ‎ 15.1 x 15.6 x 20.7 inches; 19.9 pounds


Item model number ‏ : ‎ A219


Date First Available ‏ : ‎ May 14, 2013


Manufacturer ‏ : ‎ Rolf C. Hagen (USA) Corp.


Best Sellers Rank: #10,386 in Pet Supplies (See Top 100 in Pet Supplies) #31 in Aquarium Filters


#31 in Aquarium Filters:


Customer Reviews: 4.6 4.6 out of 5 stars (3,431)


Brand Name: Fluval


Model Number: A219


Global Trade Identification Number: 93


Number of Packs: 1


Manufacturer: Rolf C. Hagen (USA) Corp.


Number of Items: 1


UPC: 015561102193


Manufacturer Warranty Description: 3 Year Limited Warranty The Fluval FX4/FX6 High Performance Canister Filter is guaranteed against defects in material and workmanship under normal aquarium usage and service for 3 years from date of purchase. Non-replaceable and non-serviceable parts will be repaired or replaced at Rolf C. Hagen Inc.’s discretion, free of charge, when the complete filter is returned with all components along with a valid proof of purchase and postage paid. This warranty does not apply to any filter that has been subject to misuse, negligence or tampering. It does not apply to filters which have been incorrectly assembled or unsuitably maintained or where installation and maintenance instructions have not been followed correctly. The warranty does not apply to wear and tear parts such as the impeller, impeller cover or motor seal. No liability is assumed with respect to loss or damage to livestock or personal property irrespective of the cause thereof. Before returning the filter under warranty terms, please ensure that all setup and maintenance instructions have been followed. If you are in doubt, please contact your local aquatic specialist retailer for further advice before returning the product. THIS DOES NOT AFFECT YOUR STATUTORY RIGHTS.


Unit Count: 1 Count


Specific Uses For Product: Indoor


Included Components: Product in Descripton


Item Type Name: Fluval FX6 High Performance Canister Filter


Manufacturer Part Number: A219


Power Source: Corded Electric


Flow Rate: 3500 liters per hour


Maximum Lifting Height: 21 inches


Horsepower: 41


Material Type: Rubber


Color: Black


Product Style: FX6 Filter


Item Dimensions L x W x H: 20.87"L x 15.75"W x 15.75"H


Item Weight: 19.9 pounds


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Aug 16

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

    • Simply the best filter on the market.
Size: FX6
The Fluval FX line of filters is a real work horse which rarely goes wrong if you do the upkeep on it. I use one on the tank I have my turtle in, and it keeps the water crystal clear, even though the old boy digs a lot an tries everything he can to cloud up the water. If I take it off line for cleaning (which is a breeze) or maintenance, it will get the water clear again within an hour if the turtle has been very active while it was off, and much sooner if he wasn't moving around too much. He's a very active turtle, and a very messy eater, but he's neither active enough nor messy enough to overwhelm the FX-6. I also use an FX-6 on my hillstream tank which requires a lot of flow. It pushes the water through at a very good clip so that the stream has a pretty good current for my hillstream loaches and for my rainbow shiners to run in when they're getting ready to spawn. I have the FX-4 on a 20 gallon tank which is probably just a bit overpopulated, But again, it is a good enough filter that it keeps the water quite clean. With surface skimmers on my tanks, even the water's surface is clear. To clean the filter media, all you need to do is lift the media baskets out, the use the filter's bucket to clean the sponges and reusable media, replace the media which has broken down too much to be reused, or which uses chemical treating, then either empty the old water out and replace it with fresh clean, or keep the old water if it's not too bad (it is almost always too bad). The reason you clean the media in the water the filter bucket has in it is so that you don't loose any of the beneficial bacteria which is growing in it. The FX series of filters have variable flow valves, which is a nice feature, though many filters have that. If you close the valves before opening the lid of the filter, you don't have to worry about draining the hoses, and they will be good to go when you turn the filter back on and open the valves. No priming needed. Everything in this filter is easily repairable if something goes wrong. If something happens which wears out the impeller, it's very easy to take the old impeller out, and drop a new one in. It's also easy to replace all the O-rings when they get old and start to loose their ability to seal the unit. If you're unlucky, you might need to do that once a year, but it's more likely that you'll just need put new lubricant on them. I am mechanically challenged, so if I find it easy to take care of, I'm sure just about anyone will be able to do it. I have had problems with several of the other big brands of filter makers, but I have never had a Fluval FX series filter go south on me. I recommend them to anyone who wants to keep their fish's environment clean and healthy. If I ever start another tank, I'll definitely be buying another Fluval FX. ... show more
Reviewed in the United States on October 24, 2024 by K. Porterfield
    • BEST FILTER EVER!!!
Size: FX6
We bought this canister filter for our aquatic turtle in Dec 2020 and it was the best investment ever!! It's quiet and works non stop cleaning her 100 gal tank! Woke up this morning to her tank looking horribly bad! The water, which is usually clear to clear with a slight green tint to it, was a dark muddy mess and we couldn't even see our 11 inch turtle, Crush! We thought our fantastic filter had conked out, but once we drained the water we could see what had happened... our silly girl had knocked the input tube apart and had caused a big air bubble in the filter, and subsequently the filter dumped a ton of muck back into her tank trying to fix the issue. So we did a cleaning of the tank and hooked the filter back up and everything is running smoothly & quietly just as it should!!! We love this filter... it just needs to be taken apart and cleaned every 6 months, witch we do like clockwork! We had tried other filters from our local pet store before getting the Fluval FX6 and they were all a waste of time and money! I can't recommend the Fluval FX6 enough! ... show more
Reviewed in the United States on March 20, 2026 by Darlenegrau1
    • Send it!!! You won’t regret it.
Size: FX6
Ive been running the Fluval for about 3 months now, and I am absolutely OBSESSED with its quality. I have a 75 gallon tank with a turtle and pleco (both produce A LOT of waste). Previously I was a die hard Penn Plax Cascade fan for the last 5 years, but my last two had motor failures and they changed their warranty terms finally, so I decided to switch it up. Long ago I wanted a Fluval, but but the price was steep so I settled for less and let me just say it’s the best investment you can make. It’s quiet (don’t know why other reviews say it’s not unless they are keeping their water levels really low), my tank remains crystal clear with my normal monthly maintenance routine, and it is easy to clean and change out my media. The fasteners are really not that complicated and don’t take that long to unlock like other reviews say. The canister itself is designed so that it is air tight and I’ve had no signs of leaking. The outtake is made so you have two options to direct the flow of your water which is helpful if you have a basking platform above half of your tank. Highly recommend. ... show more
Reviewed in the United States on October 1, 2025 by Carley
    • Water parameters stay consistent. It is very effective in removing the unwanted fish waste.
Size: FX6
The Fluval FX series canister filters are top quality. The product has an amazing warranty and help is available if needed. This product is sold globally and contains directions and replacement parts list in multiple languages. It is very easy to set up and install all components. I have 4 fx series filters I have them on every fish tank. I will never go back to a hang on back filter after I started to use canister filters. Im a customer for life. ... show more
Reviewed in the United States on March 17, 2026 by Scott Woodhouse
    • Great upgrade from the 406s
Size: FX6
Review Image by Gordon L. Malboeuf, Jr.
Review Image by Gordon L. Malboeuf, Jr.
Review Image by Gordon L. Malboeuf, Jr.
In my opinion, Fluval makes the best filters, absolutely silent when properly maintained. I bought the FX6 to take the place of two 406s I have been running on my 90 gallon aquarium. It took me a while to figure out the filtration flow path but it became obvious after understanding the internal tubes. Still, it would be nice to have a flow diagram included in the owner's manual. The only issue I experienced was more related to the placement in my stand/cabinet but I must assume that most people would run into the same issue if they have a similar cabinet. I wish Fluval would consider using better rubber feet on the legs to prevent vibration but I used rubber/cork pads to isolate my Fluval FX6 from the cabinet floor. The tiny rubber pads that came with the filter were not enough to prevent the filter from developing a low-frequency vibration that resulted in the whole cabinet emitting a very annoying hum. The filter itself is very quiet but sitting in the hollow cabinet allowed the conditions to arise. The filter does not touch the sides of the cabinet nor do the hoses so I knew the filter feet (3) were the only contact point. As soon as I placed these under the feet the vibration ceased and no more humming noise in the living room! Worked like a charm and for less than $8, a very cheap fix! (Bought on Amazon). As I imagined, the FX6 is keeping my water crystal clear with the filtration setup I am using internally that includes Purigen and 2 polishing pads in the last stage. I trust I will get 3 month between cleanouts that I was getting with the 406s with bi-weekly 25% water changes. Been up and running for over a week now and water parameters are perfect. Very happy with this filter. If you have a vibration issue, this should help you eliminate it as well. ... show more
Reviewed in the United States on December 19, 2018 by Gordon L. Malboeuf, Jr.
    • Amazing!
Size: FX6
Amazing filter. Reading through how to use the product feels like it will be a breeze to use. Has my 125gal tank looking amazing. Suction and adjustability is top tier. Was afraid to cut the hoses to size but it makes sense and was really easy to do. I’m hoping I can rig up a system to use the bottom hose attachment with my long hose. Hopefully I don’t make a mess! ... show more
Reviewed in the United States on April 10, 2026 by Jeremy Braun
    • Shipping time is the worst
Size: FX6
Fluval makes some of the best equipment for the fish/reef keeper. Unfortunately, the people who sell the product are bad at shipping in a timely manner. Why does a product that costs over $400.00 take well over a week to be delivered? Whoever is in charge of this needs to tighten up their skill because it’s unacceptable. I could have spent $20.00 more and just bought it from PetSmart and not have to wait 10 days for my biological filter to die. ... show more
Reviewed in the United States on July 11, 2026 by Ross Cumberledge
    • Moves a lot of water; Rock-solid construction.
Size: FX6
Review Image by the angler
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. ... show more
Reviewed in the United States on June 14, 2018 by the angler

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