6 Best Nano Aquariums Reviewed (2020 Buyer’s Guide)

Nano aquariums are constantly growing in popularity because they’re making it easier and easier for you to own a beautiful reef or freshwater aquarium with limited space.

However, not all are made equally–choose wrong and you’ll waste your money.

And if you’re new to the hobby, it can be tricky understanding what exactly makes a nano aquarium great.

Luckily for you, in this guide you’re going to learn exactly what you need to know to ensure sure you pick the best nano aquarium.

You’ll discover what most newbies don’t think about when picking their nano tank–giving you the best chance of maintaining a beautiful and healthy aquarium.

At the end, I’ll provide some detailed product reviews so you can find what you need.

Overview: What Is The Best Nano Aquarium

The best nano aquarium for saltwater tanks is the fluval sea evo satlwater kit.

Tetra Aquarium 20 Gallon Fish Tank Kit, Includes LED Lighting and Decor
Tetra Aquarium 20 Gallon Fish Tank Kit, Includes LED Lighting and Decor

    Last update on 2020-10-19 / Commissions Earned / Images from Amazon Product Advertising API

    The best nano aquarium for freshwater tanks is the tetra 20 gallon long.

    Sale
    Fluval Sea Evo XII Saltwater Fish Tank Aquarium Kit, Black, 13.5 gal, 10531A1
    Fluval Sea Evo XII Saltwater Fish Tank Aquarium Kit, Black, 13.5 gal, 10531A1

      Last update on 2020-10-19 / Commissions Earned / Images from Amazon Product Advertising API

      6 Best Nano Tanks For Reef & Freshwater Aquarium Reviewed

      1. Coralife Fish Tank LED BioCube Aquarium Starter Kit

      • Size: 25 gallons
      • Material: Glass
      • Dimensions: 20.2 x 21.9 x 21.5 inches
      • Key Equipment Included: LED lights, filter, air pump, temperature control system

      One to consider if you want to start a nano reef tank, it comes with an integrated 24-hour timer and customizable built-in filtration system.

      Says the size is 32, but it actually holds approximately 25-gallons.

      The LED lighting and sleek hood is excellent for bringing the ambiance of a small coral reef environment into your home, office, or school.

      It’s built to mimic the natural daily light cycle, including programmable functions like sunset/sunrise and moonrise/moonset.

      Made from glass, the front panel is curved, providing viewing angles on the front and sides with minimal distortion.

      The tank looks very cool, however you are sacrificing some surface area. An issue many users have face is the noise from the fan, but you can easily replace this if it bothers you.

      And the chamber to keep your equipment can become cramped once you’ve added your protein skimmer etc.

      If you’re looking for a high-quality aquarium kit with integrated programmable LED lighting, you should consider the Coralife BioCube.

      Pros

      • Clear view with minimal distortion
      • Easy to set up
      • Comes with a excellent customizable filtration system
      • Looks great
      • Kit comes with almost everything you need to start your own nano reef tank
      • LED lights are excellent

      Cons

      • Heavy
      • Fan is loud
      • Cube shape so your sacrifice some surface area
      Coralife LED BioCube Aquarium Kit, 32 Gallon
      Coralife LED BioCube Aquarium Kit, 32 Gallon

        Last update on 2020-10-19 / Commissions Earned / Images from Amazon Product Advertising API

        2. Tetra 20 Gallon Aquarium Kit

        • Size: 20 gallons
        • Material: Glass
        • Dimensions: 27.9 x 16.1 x 20.4 inches
        • Key Equipment Included: LEDs, 100 watt heater, Tetra Whisper 20 filter, Digital Thermometer, 37″ Frame Hinge, 4″ Fish Net.

        Packed with extras, If you want to create a traditional freshwater aquarium with natural scenery, the Tetra 20 gallon aquarium kit is one you need to look at.

        It’s 20 gallons, so it’s right on the money when it comes to getting a great beginner size tank. Its rectangular shape provides plenty of surface area and makes it easy to clean.

        Like the BioCube, the LED hood is sleek and looks great.

        The LEDs provide sufficient natural daytime and nighttime lighting for freshwater aquariums, but not if you want to keep corals.

        The heater and filter are both adequate, but not the best quality overall.

        Personally, I would replace both of these as the filter is not 3-stages and you cannot adjust the heater, meaning it stays around 80 degrees fahrenheit.

        Now, this is only going to be a problem if the fish you want to keep require different a different water temperature.

        Overall, based on the build quality and price of the actually tank, if you’re a beginner this is an excellent nano aquarium kit to get you started.

        Pros

        • Easy to set up (comes with clear manual)
        • Packed with extras
        • The tank looks great and is rectangular for maximum surface area
        • High build quality (made in USA)
        • Durable and bright LED lights
        • Lifetime warranty

        Cons

        • Filter is not 3 stage and can be loud
        • Cannot adjust the heater (only a problem if 80F is too hot for your fish)
        Tetra Aquarium 20 Gallon Fish Tank Kit, Includes LED Lighting and Decor
        Tetra Aquarium 20 Gallon Fish Tank Kit, Includes LED Lighting and Decor

          Last update on 2020-10-19 / Commissions Earned / Images from Amazon Product Advertising API

          3. Fluval Sea Evo Saltwater Aquarium Kit

          • Size: 13.5 gallons 
          • Material: glass
          • Dimensions: 22 x 11.5 x 15 inches 
          • Key Equipment Included: integrated 14000 K LED light, circulation pump, 2 stage filtration in a built in filter compartment, mechanical, biological and chemical filter media

          The Fluval Evo is a gorgeous little 13.5 gallon tank with a built in filtration compartment.

          The left side of the tank consists of a blacked out compartment where you can place mechanical, chemical and biological filter media. You can also place a heater (sold separately) in the compartment and keep all of your aquarium equipment out of sight.

          A circulation pump moves water around the tank and through the different stages of filter media within the side compartment.

          The integrated lighting system is capable of supporting low to medium light corals.

          I think the price is more than justified on this item considering that the only extra equipment that you need to get this up and running is a heater.

          I’d recommend adding live rock to the system to add even more biological filtration.

          I’ve always found Fluval to be a quality company that’s top notch and reliable, so I have a lot of faith in their products.

          Pros: 

          • Sleek all in one system 
          • Keeps equipment hidden
          • LED lights that can support a nano reef
          • Company known for reliability and durability

          Cons: 

          • Some users complain the circulation pump isn’t powerful enough
          • Heater sold separately
          Sale
          Fluval Sea Evo XII Saltwater Fish Tank Aquarium Kit, Black, 13.5 gal, 10531A1
          Fluval Sea Evo XII Saltwater Fish Tank Aquarium Kit, Black, 13.5 gal, 10531A1

            Last update on 2020-10-19 / Commissions Earned / Images from Amazon Product Advertising API

            4. SeaClear 29 Gallon Show Acrylic Aquarium

            • Size: 29 gallons
            • Material: Acrylic
            • Dimensions: 30 x 12 x 18 inches
            • Key Equipment Included: Fluorescent lighting

            Lacking in equipment, but don’t let that put you off because it makes up for it with its polished high-gloss look and overall build quality.

            It’s a great choice if you already have equipment or prefer buying it separately.

            It does include fluorescent lighting, however, it’s not the best. I recommend if you go for this nano tank, you upgrade the lighting.

            Made from crystal clear acrylic, consider this one if you’re worried about cracking or damage, and want a safer set up because you have kids or other pets.

            One of my favorite features is the virtually invisible seams, as they make for excellent viewing.

            The tank is pre-made with hole for you to fit your own filter and heater etc. So you don’t need to worry about drilling your own holes. A plus if you’re not the most DIY savvy person.

            Apart from the lighting not being good enough, the lid is the only other downside. It doesn’t come off, so it can be tricky moving things in your tank or cleaning it.

            Overall, this is an excellent, durable nano aquarium if you want to customize with your own features.

            Pros

            • Lightweight, but strong and durable
            • Crystal clear acrylic
            • Has a modern high-gloss design
            • Safe for freshwater and saltwater nano tanks
            • Rectangular shape provides an excellent surface area for beginners
            • Clear seams make for excellent viewing
            • Lifetime warranty

            Cons

            • You’ll need to upgrade the lighting
            • Lid does not come off
            SeaClear 29 gal Show Acrylic Aquarium Combo Set, 30 by 12 by 18', Clear
            SeaClear 29 gal Show Acrylic Aquarium Combo Set, 30 by 12 by 18", Clear

              Last update on 2020-10-19 / Commissions Earned / Images from Amazon Product Advertising API

              5. Marina LED Aquarium Kit

              • Size: 20 gallons
              • Material: Glass
              • Dimensions: 24 x 12.5 x 16.5 inches
              • Key Equipment Included: Everything a beginner would need (excluding a heater)

              If you’re brand new to the wonderful world of fish-keeping, this is a tank you should think about getting.

              This kit includes everything you need to get started: filter, LED lights, water conditioner, fish food, etc. etc. Too many to list without boring you to death.

              It even includes a great guide on setting up your first freshwater aquarium.

              The included filter is good enough to start with, quiet, and doesn’t take up much space.

              However, it doesn’t have a 3 stage system, so you may want to look at replacing this.

              LED lighting is energy-efficient and provides excellent daytime lighting. If you like moonlighting, you would need to replace the current light fixture.

              Even if you wanted to replace the filter, lighting etc. that’s included, the overall build quality of the nano tank and its beginner friendliness makes this a very good option for its price.

              Pros

              • Comes with EVERYTHING you need to get started
              • 360 viewing angles
              • Filter is quiet
              • Daylight LEDs are good quality
              • Easy to clean and maintain
              • Excellent option if you are brand new to the hobby

              Cons

              • Filter is not 3-stage
              • If you want moonlighting, you’ll need to replace the current LED fixture
              Marina Aquarium Kit - 20 gallon Fish Tank - LED
              Marina Aquarium Kit - 20 gallon Fish Tank - LED

                Last update on 2020-10-19 / Commissions Earned / Images from Amazon Product Advertising API

                6. Perfecto 20 Gallon Long Aquarium

                • Size: 20 gallons
                • Material: Glass
                • Dimensions: 30 x 12 x 12 inches
                • Key Equipment Included: none

                This tank is a classic glass 20 gallon long with a black metal frame around the top and bottom.

                It’s a good option for anyone who wants to buy just the tank and pick out their equipment separately, instead of going with a kit.

                A 20 gallon long maximizes the footprint and surface area. So it’s great for bottom or top dwellers. But this shape isn’t always the best for midwater fish since it’s more shallow.

                Pros

                • Great shape for fish who like a longer tank
                • Lets you pick out your own equipment

                Cons

                • Not optimal for midwater fish
                Alternative Product: Aquarium Masters 20 Gallon Long
                Alternative Product: Aquarium Masters 20 Gallon Long

                  Last update on 2020-10-19 / Commissions Earned / Images from Amazon Product Advertising API

                  My Pick For The Best Nano Aquarium

                  After checking out the top choice for nano aquariums, here are my best picks:

                  The best nano aquarium for saltwater tanks is the fluval sea evo satlwater kit.

                  The best nano aquarium for freshwater tanks is the tetra 20 gallon long.

                  Tetra Aquarium 20 Gallon Fish Tank Kit, Includes LED Lighting and Decor
                  Tetra Aquarium 20 Gallon Fish Tank Kit, Includes LED Lighting and Decor

                    Last update on 2020-10-19 / Commissions Earned / Images from Amazon Product Advertising API

                    Sale
                    Fluval Sea Evo XII Saltwater Fish Tank Aquarium Kit, Black, 13.5 gal, 10531A1
                    Fluval Sea Evo XII Saltwater Fish Tank Aquarium Kit, Black, 13.5 gal, 10531A1

                      Last update on 2020-10-19 / Commissions Earned / Images from Amazon Product Advertising API

                      What Makes an Aquarium Nano?

                      It’s a compact fish tank designed so you can nurture a small ecosystem in a smaller space.

                      Now, the term “Nano tank” isn’t well-defined in the hobby, however, the name is generally given to aquariums holding 30 gallons or less.

                      They provide an alternative if you don’t have enough space to own a large, expansive aquarium.

                      Why You Should Buy a Nano Aquarium

                      There are a number of reasons (or benefits) to get yourself a nano fish tank, and if you’re reading this guide, you’re no doubt aware of some of them.

                      Benefits include:

                      • Cheaper to run
                      • Space is not an issue
                      • Less time-consuming
                      • Weight is not an issue

                      Let’s break these down one-by-one.

                      Cheaper to Run

                      Look, it’s possible you will find bigger tanks for a cheaper price. However, that’s not always the case.

                      And, most nano aquariums come as a complete kit. Including filters, lights, pumps etc. Making your upfront equipment costs more manageable.

                      As well as this, you’ll find:

                      • You don’t need as many decorations, plants, live rock, corals, substrate etc.
                      • You don’t need as many pumps to create suitable water circulation.
                      • Your light fixture and other electronic components will be smaller and use less energy, so you save on utility bills.
                      • If want to own a nano reef tank, your aquarium salt will last longer because you don’t have to mix as much.

                      Space is Not an Issue

                      Their, well, nano. They don’t take up much room at all.

                      This makes it easier for you to find space in your apartment, condo, dorm, bedroom, or office  to own the aquarium you’ve always wanted.

                      Less Time-Consuming

                      I know, I always go on about water changes.

                      For new aquarists, the idea of doing regular water changes is sometimes enough to put them off the hobby all together.

                      However, with a nano aquarium, let’s say 20 gallons, a weekly 20-25% water changes is much faster than a large 125 gallon tank because you’re only changing 4 gallons of water.

                      Weight is Not an Issue

                      You see, when filled with water, an aquarium can get very heavy.

                      When you start mentioning 125 gallon systems, most cabinets or tables may not be able to handle all that weight.

                      With nano tanks, this is rarely an issue since they don’t weigh anywhere nearly as much.

                      You may even have to shell out again for a special aquarium stand.

                      With nano tanks, this rarely and issue as they don’t weigh anywhere near the same.

                      And hey, if you get bored or don’t like where you tank is located, it’s much easier to move a 20 gallon setup.

                      Why You Shouldn’t Buy a Nano Aquarium

                      Let’s be real, there are some reasons as to why you might want to get a larger tank over a nano.

                      If you want to own a highly diverse ecosystem with lots of fish, plants, or corals etc. It’s unlikely a nano tank is going to provide the space you need to run a healthy tank.

                      If you’re a beginner, you should know it is harder to run a successful aquarium in a small nano tank.

                      Why?

                      Because you have less room for error: harmful toxins will build up faster, and any changes to the water chemistry or temperature is going to have a bigger effect.

                      However, I am talking about small nano aquariums approximately 10 gallons or less.

                      Remember, nano tanks can go up to 30 gallons.

                      And personally, I recommend new hobbyists to always go with 20 gallon+ tanks.

                      They provide you with enough room to make mistakes and not worry about serious consequences, whilst being small enough to fit in most spaces.

                      If you’re a pro, and want to challenge yourself, maybe going with a smaller aquarium will test your abilities.

                      How to Choose The Best Nano Aquarium

                      When it comes to finding the best nano aquarium for yourself, the first thing you need to think about is your own ability as a fish keeper.

                      Are you a confident, experienced aquatist?

                      Then the size of your tank shouldn’t be a problem.

                      However, if you’re new to the hobby, I strongly recommend go don’t go any lower than 20 gallons.

                      For the reasons I touched on earlier, you’re going to increase your chances of running a successful, vibrant aquarium.

                      Once you’ve decided how confident you are in your ability to maintain a healthy aquarium, the next thing to look at is what the aquarium is made from.

                      Glass vs. Acrylic Nano Aquariums

                      When it comes to deciding whether you want a glass or acrylic nano aquarium, it’s not a case of one-size-fits-all.

                      What you need to do is look at the pros and cons and decide for yourself which fits your needs better.

                      Here are the pros and cons for both glass and acrylic nano aquariums:

                      Pros of Glass Nano Aquariums

                      • Small to medium size glass aquariums tend to be less expensive
                      • Harder to scratch then acrylic
                      • More readily available
                      • Less visible distortion
                      • Maintains its clarity: light and chemicals will not stain it yellow over time
                      • Tend to be built using industry standard sizes. Makes it easier to find accessories

                      Cons of Glass Nano Aquariums

                      • Heavier than acrylic
                      • If it does scratch or chip, it’s very hard to fix
                      • Limited shapes
                      • By comparison, it’s easier to break than acrylic (it’s still very hard to break the glass)
                      • It’s hard to drill into glass successfully. This is a con if you ever want to customize your tank with special overflow or filter systems.

                      Pros of Acrylic Nano Aquariums

                      • Lighter and easier to move
                      • Very robust and hard to break
                      • Lots of variety when it comes to shapes
                      • Easy to drill holes in and customize with accessories
                      • Easy to repair, re-polish, and refinished if it breaks or is damaged
                      • Very clear (if yours is hazy, you may have to buff and polish it)

                      Cons of Acrylic Nano Aquariums

                      • Easy to scratch
                      • The bottom tends to be weaker. You will need to make sure the bottom is on a surface, or you may risk the pane coming apart from the frame and causing leaks or total bottom-outs.
                      • Can become discolored over time and turn yellow
                      • Tend to cost more
                      • If you get a unique shape, it could be hard to find equipment to fit the size

                      Look:

                      Both acrylic and glass are both good and bad in different ways.

                      What you need to decide is which pros are more suited to what you want to achieve and your personal situation.

                      Don’t get too worked up over glass or acrylic, both are proven to work. Simply look at the pros and decide which hold more weight with you.

                      The next step in this buyers guide is to look at the shape of the aquarium.

                      What’s The Best Shape For a Nano Aquarium?

                      The shape and dimensions of your nano tank can play a big role in the performance of overall success of your aquarium.

                      You need to consider the length, width, and height.

                      • Length: the measurements from left to right or right to left
                      • Width: how deep the tank is from front to back
                      • Height: how tall the aquarium is

                      When it comes to the importance of each measurement, it may vary depending on which type of fish you want to keep.

                      For example, Angelfish do better in tall tanks because of their swimming patterns. Where as Cichlids need a larger footprint (length and depth) to establish their territories.

                      However, when it comes to general fishkeeping–length is the most important.

                      Here’s why:

                      Your fish need oxygen to survive, and most of the oxygen is going to come from the surface. So by choosing a longer nano aquarium with a larger surface area, more oxygen is going to enter the water.

                      That’s why, in my opinion, rectangle nano aquariums are the best for beginners and general fish-keeping.

                      Look, I’m not saying you can’t go with other styles. Many aquarists have had major success with all kinds of shapes.

                      • Cube tanks look classy, but come with a smaller surface area so you won’t be able to keep as many fish.
                      • Bowfront tanks are best used as a show tank. They look awesome, if you don’t have any scratches, and are good for stocking.
                      • Hex-front tanks are a cheap imitation of a bowfront.
                      • Hexagon tanks are the worst in my opinion. They’re tall, lack surface area, and are difficult to aquascape, stock, and maintain etc.

                      Rectangle tanks are your best bet for success.

                      What Kit Does it Come With?

                      This isn’t essential, as you can easily pick up any extra equipment you need at your local fish store, on Amazon, or other online stores.

                      However, combo systems can prove to be well worth the money as they tend to come with filters, lights, and heaters to get you started right away.

                      This can be important if you want to get an unusual shape or a smaller nano aquarium, because you know everything is going to fit perfectly with your setup.

                      The only downside is, sometimes they come with items you may not need, or they’re not the best quality. Which is something I will address in the individual product reviews.

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