Keeping and maintaining aquariums can be just as challenging as it is rewarding. There’s obviously a lot of work, knowledge and labor that goes into creating one. Which is why, we always recommend enthusiasts to start with something small, manageable, easy yet substantial. In the process, as a result, you not only get to fulfill your hobby or interest, but also get to experience the commitment needed to maintain such hobby. But starter aquarium kits are heaps tough to get right on your first attempt.

We are therefore on a quest to make sure you find the perfect one. And on our search for THE ONE, we came across a very interesting candidate: the Fluval Flex 57 – 15 Gallon Nano Glass Aquarium Kit, which we will review for you today! Worth the buy? Let’s find out!

Fluval Flex 57 Nano Glass Aquarium Kit Review

Let’s talk about the design, look & feel, capacity the gadgets included with this aquarium kit. Then we will talk about some pros & cons, followed by some alternatives of that are available in the market.

One of the things that attracted us to this aquarium kit is the look. Okay, we know that probably sounds too easy and unreliable, but hear us out. The Fluval Flex 57 – 15 Gallon Nano Glass Aquarium features a very uncommon and unique shape to it. It isn’t your regular fish bowl or the standard rectangular shoes box kind of thing.

The Fluval Flex 57 – 15 Gallon Nano Glass Aquarium has very sharp edges and lines, but uses a very curved front glass which softens the overall look of the product. Definitely a good looker! But hey. Beauty isn’t going to cut it. So what else is up for offer?

Design Specs

The Fluval Flex 57 – 15 Gallon Nano Glass Aquarium Kit measures 16 inches in width, 15 inches in depth and 15 inches in height. Clearly not the largest aquarium ever, but just the right size to start with. The product comes in black and shows off this fading or ombre color effect on the sides. In conjunction with the curved glasses and soft features, the aquarium conveys a very contemporary cum modern design.  Perfect for modern homes. The plastic construction however, isn’t so great. Feels cheap and toy-ish… .


One thing many people don’t know is that size comes second. The capacity of your aquarium is always the first priority.  The Fluval Flex 57 Nano Glass Aquarium Kit offers you a 15 gallon, or 57 liter, capacity.

Although we must point out, the aquarium is, at best, 10 to 12 gallons in reality. False ad,  but still ideal for petite fins. We highly recommend keeping smaller fishes like betta, guppies or tetras in them.

Great for snails and shrimps too! Also, it is a great size to condition or safely home your fishes while you are busy readying their main aquarium.

Filtration System


Keeping your water clean is absolutely essential if your want happy, beautiful and fluttering fishes and species. Something that’s really impressive about the Fluval Flex 57 – 15 Gallon Nano Glass Aquarium Kit is that it does not skimp back on the parts.

This kit comes with a 3-stage filtration system! You get the best of all 3 words; mechanical, chemical and biological media for the best cleaning efficiency! Although we would appreciate the ability to adjust it.

Whatever it is, at the end of the day, the water in your aquarium is cleaned and sifted and sieved to a clean and crystal clear result that your fishes will love and so will your eyes! Murky, smelly water is a total deal breaker for us, and the Fluval Flex Aquarium Kit’s 3-stage filtration system definitely earns the point from us!


Normally, small aquariums are heavily compromised on parts and quality. But the Fluval Flex is definitely a more sincere product. Not only does it come with the 3-stage filter, but it also includes LED lighting system. The lighting system consists of a 7500K LED lamp which is set to make sure that your aquatic plants and fishes enjoy the best sort of light for optimal growth and color correction!


One of the best features about the Fluval Flex Nano Glass Aquarium Kit, for us at least, has to be it programmable light settings which you can control through a remote controller! You can set the lighting to a wide range of reds, greens, blues and whites, or RGB+W colors. And to add to this, the remote controller also allows you to set special effects like faded cloud cover and lightning bolts. A theatrical touch to your aquarium!


  • Lightweight and compact
  • Includes 3-stage filter
  • Has versatile lighting system
  • Can be controlled via remote controller
  • Great for small fishes and plants


  • No flow rate adjustability
  • Black plastic scratches easily
  • 10 gallon; false advertisement
  • Flimsy, thin lid

Some Alternatives You May Also Consider

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If you are looking for more options of 10 gallon tanks or 20 gallons tanks here you go.

You can check out our reviews on some other Aquarium Kits –

  1. Fluval Edge Review
  2. Fluval Spec V Review
  3. Fluval Spec iii Review
  4. Marineland Aquarium Review

Fluval Flex Review Video

Let’s watch this informative video to learn more about the awesomeness of Fluval Flex 57 Nano Glass Aquarium Kit –

Frequently Asked Questions About the Fluval Flex Aquarium Kit:

Does the Fluval Flex 57 – 15 Gallon Nano Glass Aquarium Kit come with a lid?

Yes, it does in fact. The Fluval Flex 57 aquarium kit includes closed lid underneath which you have your LED lights.

Would it be able to sustain aquatic plants?

We don’t see why not! It would be a great aquarium for aquatic plants and aquascaping, but mind you, the capacity alongside the lighting ability means you can only sustain a few types and species of plants.

Does the Fluval Flex 57 – 15 Gallon Nano Glass Aquarium Kit come with any stand?

No, the stand is included in the kit.

Would it be okay for a saltwater setup?

We wouldn’t say it is. The lighting and filtration system is definitely more geared towards fresh water setup.

Final Words

And there you have it, folks! Our honest and unbiased review of the Fluval Flex 57 – 15 Gallon Nano Glass Aquarium Kit! Verdict? Well, this clearly isn’t the crème de la crème of starter aquariums. Far from flawless or perfect, but .. .. it is still a pretty sweet deal! You get the entire setup ready for you, it is good-looking, and it does the job pretty fairly.  We’d give it a 7.5/10. Not bad!

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