Fluval FX6 Canister Filter Review: The Best For Your Aquarium

When the Fluval FX5 was released to the world, most aquarists saw it as a holy grail. It revolutionized how the canister filters in the market were designed, and for the longest time, it has been the leading canister filter in the market. But now the long waited Fluval FX6 canister filter (Style: FX6 Filter - 400 Gal ) has been released, and questions are flowing in the air.

What are some of the upgrades that the FX6 come with? Fluval FX5 vs. FX6, which is better? What are some of the accessories that the FX6 will come with? These and more questions have been asked, and today we are going to look deeply at the long-awaited Fluval FX6 filter.


Large coral aquarium with marine fish Fluval FX6 review

Large coral aquarium with marine fish

The Fluval FX6 filter’s design makes it suitable for both marine and freshwater aquarium, just like its predecessor. But before we dig in and look at what the FX6 Fluval filter brings, let’s look at some of the accessories that the filter comes with.

The capacity

The Fluval FX6 canister filter is 21 inches in height, but the capacity of this technological marvel is astonishing. Don’t let the Fluval FX6 dimensions make you skeptical. The size makes the canister flexible and can fit almost anywhere, even under large tanks.

The superior capacity of the Fluval FX6 canister filter makes it suitable for large fish tanks. The filter can handle up to 400 gallons with a filter circulation rate of 563 gallons per hour. That’s not all. This canister filter has a filtration volume of 5.28 gallons. The Fluval FX6 aquarium canister filter eliminates the need for multiple filters if you have a big tank. That also means that the noise produced from the motors is also reduced.

Most filters with additional features are expected to have a high energy consumption rate. However, the Fluval FX6 filter uses 10% less energy as compared to its predecessor models. That means you get a superb pump that’s also cheap to run.

Smart pump technology

Filtration system

By-pass is one of the common flaws in canister filters, and it can be quite annoying. The Fluval FX6 filter is engineered to precision to eliminate by-pass, which makes filtration efficient. The Fluval FX6 media consists of three filter media baskets that are removable.

That is a whole load space for you to integrate the filters that you want. Six removable foams around the baskets enable mechanical pre-filtration. The filtration system takes care of mechanical, biological, and chemical wastes. The kit comes with a complete media filter, so no additional expenditure to buy the media filters.

Regular maintenance of the canister filter is essential to get maximum output. The T-bar system makes your maintenance routine simple and easy. The systems allow for easy removal and separation of the foams. There are also inbuilt indicators to remind you to do your maintenance.

Instant-start priming system

Priming your canister filter can be a real pain. Although most of the canisters in the market today come with a self-start priming feature, the Fluval FX6 filter brings it as user-friendly as possible. Once you start the filter, it takes about two minutes to fill the filter with water. The whole takes less than three minutes for your Fluval FX6 filter to perform priming and start the filtration process.

Adjustable water flow

The Fluval FX6 filter comes with essential features that allow you to adjust the flow of water in the tank. Since this filter is designed to cater for up to 400 gallons, regulating water flow becomes very important if you are using this filter on small aquariums. A simple turning of the aqua stop valves can change from zero to 563 gallons per hour.

The aqua stop valves make your maintenance routines of the filter very easy. A 90-degree turn of the valves stops the flow of water. The purge valve eliminates the hustle of manually emptying your aquarium during maintenance. A simple turn of this Fluval FX6 water change kit will empty your aquarium through the canister. The best part of it is that you can also control the draining process. 

Multidirectional output

The current produced during filtration has a vital role in keeping the aquarium clean. The direction of the aquarium’s water can be controlled by adjusting the output and input nozzles. The multidirectional output helps you take the filtered water to the far ends of the aquarium. Another important aspect of this feature is that it helps unfiltered water to be drawn into the filter.

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The current filter produces essential also because of the animals you keep in the aquarium. With the multidirectional output, you can control the current’s strength and direction. That makes this filter suitable for almost all types of aquariums. 

Clog proof system

We all have had to deal with filters clogging at one time or another. If you haven’t, then you are the few lucky ones. The Fluval FX6 filter now erases the headache that comes with a clogged filter. The filter comes with a clog proof system that restrains debris and other particles from reaching the filter.

The fine screen on the strainer improves the filtration process because of the number of solid particles and debris that reach the mechanical filter. However, you have to be cautious of small fish getting trapped in the intake.

Noise reduction technology

Now, we all know the annoying noise that canister filters produce and the heavy vibrations. Due to the size of the filter and its capacity, the Fluval FX6 filter is considered to be relatively quiet. You might not know if the filter is on unless your environment is utterly silent. The motors of this filter are engineered to precision to reduce the intensity of the vibrations that canister filter produces.

However, there is still a slight noise when the filter is placed in the cupboard. If you want to reduce the noise, then consider putting it on a carpeted surface. The Fluval FX6 noise reduction technology is one of the best in the market today.

Assembly and set-up

What is the use of an excellent canister filter if you have to hire someone to install it and maintain it? One of the aspects that we look at when reviewing an item is how user-friendly it is. The Fluval FX6 filter comes with a comprehensive guide book on how to identify and connect the parts. It is worth noting that it is easy to get the Fluval FX6 parts if it becomes faulty, although it comes with a three-year warranty.

The hard task that you’ll have during Fluval FX6 set-up is cutting the Fluval FX6 hose to desired lengths and fastening them on the filter and your aquarium. Since the filter is self-priming, all you do is plug and play after installation. The filter also comes with a complete set of media filters, and the guide guides you what goes where.

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However, for your peace of mind, the mechanical is always the first, then biological, and lastly, chemical filters. The cleaning of the filter is also easy, as we have discussed above. The T-bar system makes it easy to remove and clean all the foams. 

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Fluval Fx6 Aquarium Canister Filter (Style: FX6 Filter)

Fluval Canister Filter, FX6 Filter (400 Gal)


  • It comes with smart pump technology.
  • It has a great circulation rate.
  • The filter comes with an anti-clogging system to help you filter to function effectively.
  • It uses 10% less energy compared to its predecessor models.
  • It comes with an instant-self priming feature.
  • The high-capacity three media baskets give more room for customization.
  • It is easy to set up and maintain.
  • The adjustable water flows feature makes using the filter much more comfortable.
  • The filter is relatively quiet.


  • The Fluval FX6 filter is quite expensive.
  • One of the significant Fluval FX6 problems is that you need to place the filter on a carpeted surface to achieve ultimate silence.


The Fluval FX6 filter has proved to be something else when it comes to aquarium filtration. Although this canister’s price is on the higher side, we cannot refute that its capacity and features make it worth the financial dent.

The Fluval FX6 filter is one of those filters that you buy and forget about the hustle that involves getting the best canister filter for you. Its capacity allows up to 400 gallons, which makes it suitable for various sizes of aquariums, and its ability to control current flow makes it ideal for multiple types of aquariums. 

So, we can say that the Fluval FX6 filter is the best filter in the market. Enjoy the great features that come with the Fluval FX6 filter while getting the value for your money.

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