Fluval Edge 6 and 12 gallon are creative and unique fish tanks manufactured by Hagen Fluval. These tanks are so great that many hobbyists want to have their own ones, except that they have already kept their aquariums for many years. In this review, I will outline the powerful features as well as the pros and cons of the Fluval Edge aquariums to help you know if these tanks are right for you or not. Besides, I also provide the methods to set up and maintain the tank as well as some stocking ideas in this article.

Fluval Edge 6/12 gallon fish tank reviews

The design of the Fluval Edge 6 and 12 gallon tanks

Fluval EDGE fish tanks have sleek and modern design with glass on 6 sides that means you can enjoy your fish from all sides including the top. The unique design gives these tanks a very contemporary look that is the reason why they are so attractive and popular in the aquarium hobby.

Fluval Edge 6 gallon fish tankFluval Edge 6 gallon fish tank

There are two sizes for choosing: 6 gallons (23 liters, dimensions: 17″ W x 14.3″ D x 13.7″ H) and 12 gallons (46 liters, dimensions: 17″ W x 14.3″ D x 22.2″ H). Both of the models are designed to become a great piece of your home decor. The top and bottom are available in black, silver, or white to suit any interior spaces of your home.

  • fluval-edge-6-gallon-aquarium-review5 star rating (5/5 by editor)Check on Amazon.com
  • Model: Fluval Edge 6 gallon
  • Tank: 6 gallon sealed glass aquarium,
  • Dimensions: 17″ W x 14.3″ D x 13.7″ H (Deep, Wide, High)
  • Light: 21 LED bulbs include 18 white and 3 blue bulbs
  • Filter: Fluval power filter with CycleguardTM
  • Additives: Nutrafin Cycle and Nutrafin Aquaplus water treatment.
  • fluval-edge-12-gallon-aquarium-review5 star rating (5/5 by editor)Check on Amazon.com
  • Model: Fluval Edge 12 gallon
  • Tank: 12 gallon sealed glass aquarium
  • Dimensions: 17″ W x 14.3″ D x 22.2″ H (Deep, Wide, High)
  • Light: 42 LED bulbs—39 white and 3 blue bulbs
  • Filter: Fluval Power Filter with CycleguardTM
  • Additives: Nutrafin Cycle and Nutrafin Aquaplus water treatment.

Instead of having to be sited on a heavy base, the Fluval Edge aquariums sit on a floating base colored to match the rest of the tank – hence the reason why it can look visually stunning in any room of your home. The unique design concealing the equipment allows these items to be hidden from view. If you position your tank at a level lower than your eyes you can enjoy the stunning effect of your fish from the above with no equipment or wires visible.

The bright white (7600 K) LED lighting system

Fluval  Edge LED lighting coverFluval Edge LED lighting cover

The aquarium LED light, which is built under the lid, includes powerful bright white LEDs (7600 K) and deep blue night-time LEDs with 3 position switches. The bright white LED light makes it ideal for setting up a planted aquarium with these tanks.

Daytime LED lightingDaytime LED lighting

Nighttime LED lightingNighttime LED lighting

The Fluval Edge LED lighting system enhances the beauty of the tank by combining with the gentle flow of water created by the filtration system to create a visually stunning effect.

The multi-stage filtration system with CycleguardTM

Fluval Edge filtration system

The filtration system. Image from Fluvalaquatics.com

The Fluval Edge power filter with CycleguardTM, which is hidden behind the main tank, is very powerful and quiet. It filters the water through 3 stages to provide a clean and healthy environment for your fish and shrimps.

  • The mechanical stage is a foam filter which traps any particles and debris for manual removal.
  • The chemical stage is a carbon insert to absorb impurities, odors, and any discoloration.
  • The biological stage is a Biomax insert which encourages the growth of friendly bacteria to deal with the nitrogenous toxins (ammonia and nitrite) produced by fish wastes.

Moreover, the filter creates a significant amount of surface agitation and movement to allow for proper gas exchange and provide an appropriate oxygen level for the fish. The filter operates so quiet that you can place the tank in any rooms from living room to bedroom.

The setup and maintenance of Fluval Edge aquariums

Most things you need to set up a freshwater tank are included into the tank kit and all you need to do is assembling these items to fulfill your setup. The products also come with the Nutrafin Cycle for quick ammonia and nitrite elimination, and the Nutrafin Aquaplus water treatment to make tap water safe for fish.

It is easy for you to assemble the tank, just a few steps, the stand snaps together and the glass tank just slides into the stand. Only takes a few minutes at most. You can easily access the inside space to set up and maintain the tank through its removable cover. For feeding your fish, simply lift off the top cover to feed your fish and the lights flip up easily to change any bulbs.

Advantages and downsides of Fluval Edge 6/12 gallon


The small sizes and very contemporary look from the tanks make it suitable for desks, tabletops or countertops in any space from your home to office. There are many colors available for choice: black, silver, or white; and you can choose the best one fit your home decor.

No unsightly wires: The water filtration system and lighting fit neatly into the stand – the cords are fed through the bottom in the back of the stand.

The multi-stage filtration and bright white LED lighting provide an environment for your fish and plants to thrive. The filter is completely hidden to provide the best viewing from the tank.

Easy setup and maintenance: just a few steps to assemble the tank to its stand and cover. The cover is removable for quick and easy maintenance. There are a number of Fluval Edge accessories designed for Fluval Edge aquariums to enhance the overall appearance and aid low maintenance that you can see in the next section of this article.


Due to access being through the top aperture only it means that anything added to the tank has to be done through this gap. So, it may be hard for you to clean the inside of the tank.

Because of their small sizes and the special designs, it will be limited to the number of species healthily kept in these tanks. Besides, I will not recommend these tanks for saltwater fish.

There are some species particularly suited to these aquariums. A few examples include small Rasbora species, guppies, freshwater shrimps, and nails… (see more species in the next section). Five or six small creatures should be able to coexist happily in most cases.

Fluval Edge accessories available for easy maintenance

A range of EDGE accessories are available making the setup and maintaining process extremely simple:

  • Zen Wall Decor Ornament – Modern, linear design ornament, made of durable resin and glass, with plant holders and a screen wall with a cutout to accommodate the filter inlet pipe and optional heater, if required.
  • Aquarium Heater – Required for tropical fish set-ups. Compact, safe and submersible, pre-set to 26 oC/78oF with no adjustment necessary.
  • Fish Net – Angled, triangular head allows access into corners. Soft mesh netting is safe for small or delicate species.
  • Gravel Cleaner – Contoured to reach all corners of the aquarium. Includes 2 cleaning heads, easy start valve, and an exclusive gravel guard.
  • Digital Thermometer – Mounts to the outside glass for an accurate and clear temperature reading.
  • Algae Magnet – Low profile design with large internal scrubbing pad for effective glass cleaning. Corrosion resistant.

You can find and buy these items here. As with any aquarium, it’s about weighing up the advantages against the disadvantages. No aquarium is perfect and only you can decide on what’s right for you and your situation. The Fluval Edge Aquarium is right up there in terms of being one of the best looking aquariums and one of the easiest to maintain. If looks and ease of maintenance are important to you then it’s an ideal choice.

How to stock a Fluval Edge fish tank?

As the capacity of the aquarium is small you need to choose fish which are suitable for a tank of this size namely:

  • Small tetras (Ember, Neon tetra, Black Neon, Glowlight), White Cloud Mountain Minnows, Danios,
  • Guppies, Endler livebearers are the best choice for Fluval Edge,
  • Small cichlid: Neo. brevis, Neo. ocellatus,
  • Rasboras: Boraras maculatus, Microrasbora erythromicronHarlequin Rasbora,
  • Small Barbs like cherry barbs can do well,
  • Kuhli loaches are small and cute fish for the aquarium,
  • Small shrimps: Red Cherry shrimps, Yellow shrimps, Crystal Red ShrimpsBlack Bee Shrimp, Bumblebee Goby…
  • Snails: Nerite nails, Apple snails, Mystery nails, Assassin snails…

Species of fish like Betta, Corydoras, Gourami aren’t suitable for the Fluval Edge as they need to gulp air from the surface. The Edge’s top glass prevents them from being able to do that if the water level is full. With these fish and other fish that exhibit that behavior, the water level will need to be lowered a little.

If choosing fish remember that they are normally introduced as young fish so you need to allow for growth. You should allocate a minimum of 1 gallon of water for every 1 inch of fish, excluding the tail. Tropical fish will require a heater suitable for the fish tank size.

Although the tank can be used for freshwater or saltwater fish, it is more suited to freshwater fish due to its small size and may pose more of a challenge as a marine set up. It is better to start with a minimum 20 gallon aquarium for stocking saltwater fish to ensure the fish healthy. It’s even the best if starting with a 55 gallon aquarium tank in this case.

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