The Best 3 Gallon Fish Tanks of 2021


A small fish at home is a great start on a growing fishkeeping hobby. A betta fish, for example would enjoy living in the best 3 gallon fish tanks on the market today. It is the perfect size for your fish to play around, swim through, and grow on its own. Getting interested in having a colorful and sophisticated fish at home starts with choosing the right home for it to develop. Aside from being a feast in the eyes as it moves and swims around, they are great in making your home feel a bit more relaxing and tranquil.

What is the Best 3 Gallon Fish Tank

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Top 6 Best 3 Gallon Fish Tanks Reviews

1. Tetra GloFish 3 Gallon Aquarium Kit with LED Lighting and Filtration


This cube aquarium is the perfect starter kit that would fit any corner of your home and office. With its compact and chic design, this makes any countertop stand out with your lovely fish inside.

Looking sleek, you will get a quality panoramic view of your fish and its lovely habitat. This 3-gallon cube aquarium has a sturdy pedestal base for a stable fit in your countertop.

The safety of your fish is also guaranteed with the tank’s Whisper Internal Filtration. This can also be hidden for a more flawless look.

Bright lights won’t be a problem with its white LED lighting system. The top is a clear canopy that comes with a feeding hole.

Your tank will be maintained with clear water as the kit comes with the Tetra 3i filter. It is easy to set up and clean, too.

The tank is made of plastic and is quite subpar to glass aquariums. However, this makes it lighter and easier to move and transfer around.


  • Sturdy base
  • Whisper Internal Filtration mechanism
  • Bright LED lighting
  • Clear cover with feeding hole
  • Easy to clean and maintain


  • Made of plastic

2. MarineLand Contour 3 Gallon Glass Aquarium Kit with Rail Light


The rounded corners of this cube-shaped glass aquarium add splendor for its overall look. The MarineLand Countour provides a safe and reliable habitat for your fish with lesser maintenance than bigger fish tanks.

LEDs with this tank comes in white and blue tones. This gives your aquatic buddies daylight and moonlight setting for a seemingly natural light cycle. The LED is hinged at the back and is easy to move when opening the top.

Is having an easy access for feeding a priority on your fish tank checklist? They have a sliding clear canopy that doesn’t restrict your hand when you feed them. Installation is quite easy, too.

The health and safety of your fish will not be compromised with this tank. It comes with a 3-stage filtration system, keeping the water and the entire environment healthy. It can get a tad bit loud, so placing it in the right area of your home can be helpful.


  • Aesthetically pleasing
  • Daylight and moonlight settings for LED lighting
  • Sliding cover for feeding
  • 3-stage filtration system
  • Easy to install


  • Motor can be loud

3. Koller Products 3 Gallon Aquarium with Filter & LED Lighting


Ease your stress away by having a lovely aquarium that fits just right in your home. This calming 3-gallon tank brags on its curved aquaview, a unique set up than what most fish tanks of the same size offer.

The LED lighting of the Koller 3-Gallon Aquarium comes in 7 bright colors. Illuminating your fish to the perfect light you want is easier and more convenient.

Organic pollutants will have no space in this compact aquarium as its filtration system purifies water at a rate of 25 gallons per hour. They can continue growing without the hassle of continually maintaining their habitat.

The unit may not be made of glass but it is made of impact-resistant plastic. It is crystal clear and you can see every activity of your fish while being comfortable in your own nook


  • Curved aquaview
  • 7 colors of LED
  • Efficient filtration system
  • Compact size
  • Impact-resistant body


  • Not made of glass

4. Koller Products 3.5 Gallon Fish Tank with Power Filter & LED Lighting


Add an extra half gallon than your regular ones with this model of Koller Products. It has a 3.5-gallon capacity with an efficient filter for a healthy and happy fish.

Teaching your child, a thing or two about the aquatic life is more rewarding with this tank. It has a curved view of the life inside making it a suitable learning environment.

It boasts its powerful internal filter that ensures the water inside is clean. Pollutants that can potentially harm the life inside can’t stay long and will be sieved through.

The lighting system that comes with the tank is energy efficient. You will be delighted with the 7 colors that it can provide you; it even comes with daylight options.

Although made of plastic, it is leak-proof and is resistant to stress. Durability of the tank and health of your aquatic pets are really ensured.


  • Additional half gallon capacity
  • Curved view
  • Powerful filter
  • 7-color LED lighting
  • Durable material


  • Made of plastic

5. biOrb Flow 4 Gallon Aquarium with LED


Keep a fish in the most elegant and aesthetic way with the biOrb aquarium. With a sleek and very modern look, this will stand out in your home and highlight the chill life of your pet.

Not being made of glass took biOrb a better advantage by constructing this tank out of acrylic. It came out more durable, lighter, and very transparent.

Oxygenation is also better with its 5-stage filtration system. Water stabilization is also one of its strongest features. LED lighting is also seamlessly built-in. Filtration and lighting are both operated at low voltage.

The size of this tank is suitable for small fish and has an extra 1 gallon compared to other small fish tanks. It is easy to install and clean. It may need a specific filter and can be a bit pricey compared to others. However, the satisfaction of its water stabilization and cleaning system is worth its price.


  • Aesthetic and elegant
  • Durable acrylic material
  • 5-stage filtration system
  • Seamless LED lighting
  • 4-gallon capacity


  • Needs a specific filter

6. Life 4 Gallon Aquarium with LED Light


All the viewing angles of this small aquarium are amazing. The walls are built for you to enjoy seeing your fish swim and lounge around with the Life Aquarium.

This acrylic-made fish tank has all its sides built for viewing. It is lighter and more durable compared to its glass counterparts. It also has a transparency rating of 93%.

Biological, chemical, and mechanical filtration are included in its filtration system. It also has water stabilization and oxygenation features.

The filter cartridge needed for this tank is easy to find as it just needs the ‘one size fits all’ filter from biOrb. Maintenance isn’t a problem at all.

The design is made to be an eye-catcher for every home. It is very pleasing and having it around will really astonish guests its powered filter is effective but may not be as strong as its competitors. A fish with a light bioload will love staying in this elegant aquarium.


  • Very attractive
  • All sides are made of acrylic
  • 5-stage filtration system
  • Easy to find filter cartridge
  • Low maintenance


  • Filters at a low bioload

3 Gallon Fish Tanks Buying Guide

Being interested in having an aquatic pet is a wonderful past time. Deciding on their home can be mentally draining as you need the right kind of tank, quality corals and plants inside, size of the aquarium, and the fish inside.

Having a small size aquarium like the 3-gallon fish tanks are best for beginners. If you are not ready to venture out and have a bigger responsibility of the larger tanks, this is the right one for you.

  • Cheaper
  • Easy to set up
  • Occupies less space
  • Lightweight
  • Low maintenance

If you have chosen to have a 3-gallon tank, there are still a few things to consider before getting yourself one.

  • The number and type of fish you have
  • Your space at home or where you may put it
  • Filtration system of the tank
  • Material of the tank
  • Lighting system

The number and type of fish you are going to house inside the aquarium should be a top priority before you go and buy one. The rule of thumb from aquarists is that each small fish should have at least 1-3 gallons of water. So, the more you have, the bigger your tank will be.

Although 3-gallon fish tanks generally don’t take too much space, it is better to set aside space in your home before buying a specific tank. Knowing its electrical placement, accessibility, and countertop material will help you decide the kind of tank you will need.

Having a mechanical, chemical, and biologic filter is beneficial for your tank. These are common and are mostly built-in. if the type of fish sheds out a lot of bioload, having a better filtration system will greatly help.

Glass, plastic, and acrylic tanks are widespread. They all have their own benefits and downsides. Glass ones are clear but may break. It is up to you on what will suit your lifestyle and preference.

Lighting is important for your tank. Most of these are built-in and are bright enough. Having daylight and moonlight settings are the perks you might want to have.

What is a 3 Gallon Fish Tank?


Small fish can live solitarily and be in a 3-gallon fish tank. This small tank is very small. It is perfect for those who want to keep an aquatic pet with a small space to allocate at home. It is ideal for a single fish and a few plants to it company.

Types of 3 Gallon Fish Tanks

Although 3-gallon tanks have the same capacity, not all tanks are created equal. They have can have different filtration systems, types of material, and form.

Filtration systems can come in 2 stages –mechanical and chemical. And the third one added in 3-stage filtration systems is the biologic. Having a quality filtration system will ensure you that the water inside your tank are kept in its healthiest form.

Glass fish tanks are clear and are durable. However, they are heavy and when they break, it will need immediate replacement. Acrylic ones are more durable and are lighter. Fish tanks can also be made of plastic. While not as clear as glass, they can come out cheaper.

The form of 3-gallon tanks are needed to be considered for certain types of small fish. The shape can come in three different forms:

  • Cube
  • Rectangular
  • Curved

Cube tanks have equal side to side and top to bottom measurements. These are perfect for slow swimmers. They can enjoy the same swimming strokes on the sides, and while ascending and descending though aquariums.

Rectangular ones have a wider space, so fish can swim through greater lengths than heights. These are perfect for fast swimming aquatic buddies. This also provides greater swimming space than cubes, as fishes tend to swim sideways then vertically.

Curved aquariums are gaining popularity. Although this can distort the image of your fish, it tends to have a magnifying effect making you see your fish more. It can come in a more interesting design if your tank is viewed as a decoration at home.

Why Do You Need 3 Gallon Fish Tank?

Small fish are interesting and are fun to learn to. They can come in different shapes and colors that are very pleasing and entertaining to the eye. If you are leaning on having one as a pet, considering a 3-gallon fish tank may be what you need.

This small tank can hold a few small fish. It is easy to set-up as most of them already come in complete sets, and are ready to install at home.

Maintenance of having a small tank is also a lot easier. As it caters to lesser plants and a fewer number of fish, you have less things to worry about when cleaning time will come.

It can also come out cheaper than larger tanks. Having one in your home is the therapy you didn’t know you need. After a day’s work, coming home to these beauties can ease away your tired and cluttered mind.

They are pleasing to the eye and are very child-friendly. If teaching your child, the responsibility of fish keeping is one of your main goals, having a 3-gallon fish tank will not be a mistake. This will be a great starter tank for those who are beginning to love having aquatic pets.

Frequently Asked Questions


How many fish in 3 gallon tank?

Having a 3-gallon fish tank is easy to overcrowd. You need to consider placing plants, stones, and another décor inside as well. A single fish can be inside a 3-gallon tank. However, if they need company 3-4 of the same kind and size can fit.

What is the best fish for a 3 gallon tank?

Needing a company is easily solved by having a small fish at home. These babies are easy to take care and they don’t take much of your time. For starters, one fish may fit inside your 3-gallon tank. Although not all fish would love to be isolated and kept alone in these tanks, some of these aquatic pets are territorial and would love to be solitary in their own tank.

Betta fish are extremely popular and are territorial by nature. They are perfect to have inside 3-gallon fish tanks.

Neon tetras are the small ones who love to be kept together with other fishes. They can be placed inside these tiny aquariums with 2-3 of their other friends.

Guppies are colorful aquatic pets who are popular among beginners. The male ones can be placed happily inside.

Other fish that can live inside these small tanks are:

  • Salt and Pepper Cory
  • Zebra Danios
  • White Cloud Minnows

How much does a 3 gallon fish tank weigh?

The material of the fish tank greatly affects its weight. Glass fish tanks are denser and generally weigh more than the others. Plastic ones mostly come in leak-proof construction and are easier to carry and move around the house. Acrylic fish tanks are durable and are also light. The average range of weight of a 3-gallon fish tank is approximately 4-12 lbs.

Where to buy 3 gallon fish tank?

A 3-gallon fish tank can be bought in some pet shops, especially if they sell small fish. But they can also be sold online, and in most websites of the brand of the fish tank you want. You can also check them out on Amazon and eBay, and other online marketplaces.


Your growing love for small fish needs to be housed in the best 3 gallon tanks that are widely available today. The aquatic buddies that are colorful and playful by nature can be kept in a space-saving tank. These tanks are fit for beginners who are passionate in having this kind of stress-reliever at home.Starting out in a small tank can gauge how much time you can devote and if the lifestyle of having an aquatic friend fits your budget. These tanks are easy to maintain and are a great piece of unique and lovely décor in homes and offices.

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