Best 2.5 and 3 Gallon Fish Tanks for Small Spaces

Fish tanks are a great way to bring a little bit of nature into your home. When it comes to finding the best fish tanks, size does matter. A 2.5 or 3-gallon fish tank is going to be your best bet for a small space. You can put them on a table or a countertop, and they will still look great. These fish tanks are also very easy to maintain.

In this article, I’ll take a look at the best options on the market, as well as what to look for when choosing a fish tank for your home. I’ll also provide some tips on setting up and maintaining your new tank.

Whether you’re looking for a sleek and modern design or something more traditional, there’s one for you on this list!

Best 2.5 Gallon Fish Tanks

#1. Best Filtration: Fluval SPEC Freshwater Aquarium Kit

Fluval SPEC Freshwater Aquarium Kit, Aquarium with LED Lighting and 3-Stage Filtration, 2.6 Gallon, Black, Large Breeds
  • 2.6-gallon etched glass aquarium with aluminum trim
  • High-output 7000K LED with all-aluminum, waterproof casing for enhanced plant growth and fish colors
  • Powerful 3-stage filtration for superior water quality and stylish honeycomb wrap to conceal rear filtration compartment
  • Includes glass aquarium with cover; LED lighting system; safe, low-voltage transformer; circulation pump with output nozzle; foam filter block with handle; activated carbon insert; and BioMax insert
  • Dimensions: 10.8 x 11.8 x 8.7 inches
  • Material: Glass
  • Shape: Square
  • Weight: 4.8 Pounds
  • Dimensions: 10.8″L x 11.8″W x 8.7″H

The Fluval Aquarium Kit provides powerful 3-stage filtration for your fish tank. This means that your water will be fresher and cleaner for your fish, and they will be able to swim and live in a healthier environment.


  • The 2.6-gallon etched glass fish tank is a perfect size for small spaces.
  • The high-output 7000K LED brings out the natural colors of your fish, making them really pop. This also enhances plant growth in your aquarium.
  • The powerful circulation pump comes with an adjustable output nozzle to ensure that your fish get the oxygen they need to thrive.
  • This 2.6-gallon fish tank has a pump and filtration system that are separate from each other, making it easy to access both for cleaning and maintenance. Meaning less time spent on keeping your fish healthy and more time spent enjoying their company.


  • No heating system

#2. Best Trendy Design: Koller AquaView 2.5-Gallon Fish Tank

Koller Products AquaView 2.5-Gallon Plastic Fish Tank with Power Filter and LED Lighting for Tropical Fish - Betta Fish (7 Color Selections)
  • FUN and REWARDING: Are you looking to buy an aquarium for your family? Owning an aquarium can be a really fun and rewarding experience and an ideal way to teach your child the responsibility of pet ownership.
  • DAZZLING COLORS: Energy-efficient LED lighting with 7 dazzling color selections to brightly illuminate your fish, choose daylight white, blue, green, amber, aqua, purple, or red.
  • COMPLETE FILTRATION: Powerful internal power filter cleans and purifies aquarium water at a flow rate of 25 gallons per hour effectively removing organic pollutants. Uses Koller Products XS replacement filter cartridges (AQ05FC-30), available on Amazon.
  • OPTIMUM VIEWING: Crystal-clear clarity so good that most think it's glass, constructed of impact-resistant plastic providing leak-proof assurance.
  • BUILT-IN LIGHT TIMER: Set your LED light to come on at the same time every day. Light uses 3 AAA batteries (sold separately) or 5V Power Adapter (AQ51000) available on Amazon.
  • Material: Plastic
  • Shape: Corner
  • Weight: 2 Pounds
  • Dimensions: 9.5″L x 9.5″W x 11.25″H

Koller AquaView is designed with a corner shape that will make your fish tank stand out from the rest. With trendy design and 7 color selections of LED lighting, you can create the perfect ambiance for your fishy friends. This small fish tank is perfect for anyone looking to add some life to their home decor.


  • The internal power filter has a flow rate of 25 gallons per hour, so it quickly cleans the water, making it crystal clear for optimum viewing.
  • If you’re looking for a fish tank that won’t break the bank and can withstand a little wear and tear, this 2.5-gallon fish tank is perfect for you.
  • Made with impact-resistant plastic, this leak-proof tank is a great option for first-time fish owners or anyone who wants an affordable, low-maintenance pet.


  • Pump is too strong for the size

#3. Best Starter Kit: Aqueon BettaBow 2.5 Gallons Aquarium

Aqueon BettaBow LED Kit Black 2.5 Gallons
  • Simple to setup and maintain, this is perfect for your betta
  • Includes: dividers, small filtration cartridge, food and water care samples
  • Uses Aqueon QuietFlow Filtration and Small Aqueon Replacement Filter Cartridges
  • Sleek, low profile LED energy efficient light hood with feeding hole
  • Elevated base adds an extra flair to the design
  • Material: Plastic
  • Weight: 3.75 Pounds
  • Dimensions: 11″L x 7.38″W x 11.75″H

This starter kit is perfect for anyone looking to get into fishkeeping. The BettaBow 2.5-gallon fish tank is easy to set up and maintain, making it the ideal choice for beginners. Plus, it’s specifically designed for betta fish, so you can be sure your fish will be happy and healthy in their new home.


  • The tank comes complete with a betta divider and 5-watt fish tank heater.
  • The small filtration cartridge helps keep the water clean and makes maintenance easy.
  • It has everything you need to create a comfortable and stylish home for your betta fish.
  • The included setup guide makes it easy to get started, and you’ll love watching your fish swim and play in their new environment.


  • The filter is not that impressive

Best 3 Gallon Fish Tanks

#1. Best with Pedestal Base: Tetra 3 Gallon Fish Tank

Tetra LED Cube Shaped 3 Gallon Aquarium with Pedestal Base
  • AQUARIUM KIT: 3-gallon, cube-shaped complete aquarium kit perfect for betta fish, goldfish, guppies, or small tropical fish.
  • INCLUDES FILTER: Includes an air pump-driven Tetra Whisper power filter to keep your tank clean and provide a healthy environment for pet fish.
  • STYLISH: Features LED lights to highlight your fish and an attractive pedestal base.
  • CONVENIENT: Clear canopy has a hole for easy feeding.
  • DIMENSIONS: 10 inches deep x 10 inches wide x 10.
  • Material: Plastic
  • Shape: Square
  • Weight: 4.4 Pounds
  • Dimensions: 10.32″L x 11.95″W x 17.5″H

Make a splash with Tetra 3-gallon fish tank! This complete aquarium kit is perfect for housing goldfish, bettas, guppies, and other small tropical fish. The included pedestal base provides a sturdy foundation for your new aquarium, while the cube-shaped design is perfect for small spaces.


  • Experience the serenity of an underwater world without all the hassle! This 3-gallon fish tank is equipped with an air pump-driven power filter and LED lights, making it easy to create and maintain a beautiful underwater environment.
  • Plus, the built-in hole makes it easy to feed your fish without disturbing their habitat.
  • The low voltage power adapter keeps things running smoothly and quietly.
  • The 10-inch depth and 10-inch width provide plenty of space for your fish to swim and play.
  • Plus, the crystal clear panoramic view lets you watch your fish in action.
  • It also comes with a guide that includes clear, step-by-step instructions for setting up this 3-gallon fish tank.


  • The powerful filtration can be dangerous for small fish.

#2. Best Self-cleaning: Back to the Roots 3 Gallon Fish Tank

Back to the Roots Indoor Aquaponic Garden - 3 Gallon Self Watering, Mess-Free Planter and Self-Cleaning Fishtank for Herbs, Microgreens, Bamboo, Succulents, and Houseplants, support Fish
  • YEAR ROUND WATER GARDEN: The Back to the Roots Water Garden Duo allows you to grow a succulent or houseplant garden all year round and comes with everything you need to get started - no green thum or big backyard needed.
  • CONVENIENT AND EASY: Harvest organic microgreens from your aquarium in just 10 days; Your Water Garden becomes a self-cleaning fish tank that also grows fresh food up top; The fish waste fertilizes the plants on top and the plants clean the water.
  • THE PERFECT LIVING HOME DECOR OR GIFT: Each Back to the Roots Water Garden Duo comes with a free STEM curriculum on aquaponic and hydroponic systems to encourage your kids to learn more about it; This award-winning ecoystem is also the perfect gift.
  • COMPLETE AQUATIC ECOSYSTEM KIT: This DIY aquaponic fish tank kit is fully equipped with everything you need to get started - radish and wheatgrass seeds, water conditioner, a growing medium for your seeds to take root, water dechlorinator, fish food, and even a fish coupon
  • Material: Acrylic plastic
  • Shape: Round
  • Dimensions: 13.4″L x 13.4″W x 9.5″H

With this garden duo fish tank, you don’t have to worry about messes or cleaning. The self-cleaning and self-watering features of this tank make it the best choice for those who want a hassle-free way to enjoy their fish-keeping hobby.


  • This two-in-one pot shaped fish tank allows you to grow microgreens on top of your aquarium.
  • As your plants grow, they help to clean the water for your fish. This is a great way to get fresh, healthy food and have a beautiful aquarium all in one.
  • This 3-gallon fish tank is not only an award-winning ecosystem, but it’s also a great way for kids to learn about aquaponics and hydroponics.
  • This makes a perfect gift for inquisitive minds.


  • Though it is self-cleaning, you do have to manually clean once a month.

#3. Best LED Lighting: Koller 3-Gallon 360 Aquarium

Koller Products 3-Gallon 360 Aquarium with LED Lighting (7 Color Choices) and Power Filter, Ideal for a Variety of Tropical Fish,Crystal-Clear Clarity,AP360A-3FFP
  • FAMILY ENJOYMENT: Owning an aquarium can be a really fun and rewarding experience while providing many wellness benefits such stress relief, sleeping better at night and better productivity at work
  • DAZZLING COLORS: Energy-efficient LED lighting with 7 dazzling color selections to brightly illuminate your fish; choose daylight white, blue, green, amber, aqua, purple, or red
  • COMPLETE FILTRATION: Powerful internal power filter cleans and purifies aquarium water at a flow rate of 25 gallon per hour, effectively removing fish waste and debris; uses Koller Products XS replacement filter cartridges, B086GMHR1P, available on Amazon
  • OPTIMUM VIEWING: Constructed of impact-resistant plastic with crystal-clear clarity so good that most think it is made of glass; providing leak-proof assurance
  • EXPERIENCE LEVEL: Beginner to advanced, easy to set up and maintain; ideal for a variety of tropical fish
  • Material: Plastic
  • Shape: Cylindrical
  • Weight: 2.5 Pounds
  • Dimensions: 10.25″L x 10.25″W x 14.5″H

Whether you want to set the mood or show off your beautiful fish, the Koller 3-gallon fish tank has the best LED lighting with 7 color choices. The 360 cylindrical shape is perfect for guppies, bettas and other small tropical fish who love to explore.


  • Tank comes equipped with an internal filter with a flow rate of 25 gallons per hour, so you can rest easy knowing your fish are well taken care of.
  • This fish tank is made with impact-resistant plastic for durability and has crystal-clear clarity for a great viewing experience.
  • It is also leak-proof, so you don’t have to worry about water damage.

Whether you’re looking for a new hobby to help relieve stress or simply want to add some beauty to your home, this colorful aquarium is a great option.


  • The filter is a bit noisy

What are the Best Fish for a 3 Gallon Tank?

3 Gallon Fish Tanks are popular among fish enthusiasts because they are small and easy to maintain. Here is a list of the best fish for a 3-gallon tank:

  • Betta Fish
  • Guppy Fish
  • Neon Tetra
  • Otocinclus
  • Zebra Danios
  • Endler’s Livebearer
  • Least killifish

You can read my detailed guide on the fish selection for a 3-gallon tank.

What to Look for When Choosing a 3 Gallon Fish Tank?

When looking for a 3-gallon fish tank, there are a few things you should keep in mind.


The material of the tank is important, as it will determine how long the tank lasts and how easy it is to clean. Glass is the best material for a fish tank, as it provides a better viewing experience and is easy to clean. However, acrylic tanks are also a good option and are often cheaper than glass tanks.


A 3-gallon fish tank is a good size for a beginner, as it does not require a lot of maintenance. However, if you plan on keeping more than three small fish in the tank, you will need to upgrade to a larger size.

You also need to think about the other elements that will go into the tank, such as a filter, heater, and decorations. All of these things need to fit inside the tank, so be sure you have plenty of room for them.

The Fish Type the Tank is Designed for

When looking for a 3-gallon fish tank, be sure to find one designed specifically for the type of fish you want to keep. The bettas and tropical fish need a water temperature between 75 and 80 degrees Fahrenheit.

Be sure to check if the tank has a heater included if you plan to keep tropical fish. Also you can ask the store staff about the recommended water temperature for the type of fish you are interested in keeping before making your purchase.

Finally, don’t forget to factor in the cost of setting up and maintaining the tank.

Introduction to small tanks

A 3-gallon tank is an excellent choice for aquarists who are short on space or looking for a low-maintenance setup. These small tanks can be a great option for beginners or those who want to add a touch of aquatic life to their home or office. While small tanks are easier to maintain and more affordable than larger ones, they also present unique challenges due to their limited water volume. This makes it crucial to carefully select the fish species, equipment, and maintenance practices to ensure a healthy and thriving environment for your aquatic pets.

Tank setup and maintenance

Proper tank setup and maintenance are crucial for the well-being of your fish in a 3-gallon tank. Here are some essential elements to consider:

  • Substrate: Choose a substrate that suits the preferences and needs of your chosen fish species. Sand or fine gravel is suitable for most species. Ensure that the substrate is clean and free of sharp edges that may harm your fish.
  • Decorations: Provide hiding spots and resting areas for your fish using decorations like rocks, driftwood, or small caves. Ensure that the decorations are aquarium-safe and do not leach harmful chemicals into the water.
  • Filtration: A small, efficient filter is essential to maintain water quality in a 3-gallon tank. Look for a filter that is designed for small tanks, offers adjustable flow, and has biological, mechanical, and chemical filtration capabilities.
  • Lighting: A moderate level of lighting is generally sufficient for a small tank, especially if you have live plants. Ensure that the light spectrum is suitable for the fish and plants you choose. Keep a consistent light cycle, ideally around 8-10 hours of light per day, to prevent stress and promote a healthy day-night rhythm for your fish.
  • Temperature and heater: Depending on the fish species, you may need a small, adjustable heater to maintain a stable water temperature. Place the heater close to the filter to ensure even heat distribution.
  • Water quality: Regularly monitor water parameters such as ammonia, nitrite, nitrate, pH, and temperature. Perform partial water changes (20-30%) at least once a week to maintain optimal water quality.

Compatibility and stocking

Selecting compatible fish species is crucial for maintaining a peaceful and stress-free environment in a 3-gallon tank. When choosing fish, consider the following factors:

  • Temperament: Select species that have similar temperaments to avoid aggression or territorial disputes. For example, avoid mixing aggressive or territorial fish with shy, peaceful species.
  • Size: Choose fish species that remain relatively small even when fully grown. Larger fish may become stressed or unhealthy in the confined space of a 3-gallon tank.
  • Dietary requirements: Ensure that the fish species you select have compatible diets, so that feeding is straightforward and no fish are left hungry or malnourished.
  • Stocking density: Avoid overstocking your tank, as this can lead to stress, poor water quality, and disease outbreaks. A general rule of thumb is to allow 1 gallon of water per inch of adult fish. However, this rule may vary depending on the specific needs and bioload of the fish species.

By considering these factors, you will be able to create a harmonious and healthy environment for your fish in a 3-gallon tank.


Providing a balanced and appropriate diet for your fish is essential to ensure their health and well-being. Here are some guidelines for feeding fish in a 3-gallon tank:

  • Types of food: Each fish species has its own dietary preferences and nutritional requirements. Research the specific needs of your chosen species and provide a variety of high-quality commercial fish foods, such as flakes, pellets, or frozen and live foods, to meet these needs.
  • Feeding frequency: Most small fish species should be fed once or twice a day. However, the feeding frequency may vary depending on the specific requirements of each species. Be sure to research and follow the recommended feeding schedule for your fish.
  • Portion sizes: Overfeeding can lead to poor water quality and health issues for your fish. Offer small portions of food that your fish can consume within a few minutes. Remove any uneaten food promptly to prevent water pollution.

Monitoring fish health

Observing your fish daily and understanding their normal behavior is crucial for identifying signs of illness, stress, or injury. Here are some indicators of potential health issues:

  • Unusual behavior: Lethargy, erratic swimming, loss of appetite, or hiding for extended periods may indicate stress or illness.
  • Physical signs: Watch for physical symptoms such as clamped fins, bloating, discolored patches, or spots on the body, as these can suggest infection, disease, or injury.
  • Breathing issues: Rapid or labored breathing can signal poor water quality, stress, or disease.

If you notice any of these signs, take prompt action to identify and address the underlying issue. Consult a veterinarian or an aquarium expert if necessary, and be prepared to administer appropriate treatments, such as medication or water changes.


Breeding fish in a 3-gallon tank can be challenging due to space limitations, but some species may still reproduce under the right conditions. If you’re interested in breeding your fish, follow these guidelines:

  • Research breeding habits: Learn about the specific breeding requirements of your chosen fish species, such as water temperature, pH, or the presence of specific plants or hiding spots.
  • Signs of mating behavior: Observe your fish for signs of mating behavior, such as increased activity, color changes, or specific courtship rituals.
  • Separate breeding pairs: If possible, set up a separate breeding tank to provide a controlled environment for mating and raising fry. This will help ensure their survival and minimize stress on the adult fish.
  • Care for fry: Once the fry have hatched, provide them with appropriate food and care to ensure their growth and survival. Newly hatched brine shrimp (Artemia nauplii) are a popular choice for feeding fry, as they are small and highly nutritious.

By following these guidelines, you may be able to successfully breed your fish in a small tank. However, it’s essential to consider the space limitations and the additional care required when breeding fish in a 3-gallon tank.

Plants and Aquascaping

Incorporating live plants and thoughtful aquascaping can greatly enhance the aesthetic appeal of your 3-gallon tank while also providing numerous benefits for your fish. Here are some recommendations:

  • Suitable live plants: Choose plants that are compatible with the size of your tank and the needs of your fish. Some small-tank-friendly plants include Anubias, Java Moss, Java Fern, and Cryptocoryne species. These plants are generally easy to care for and provide hiding spots, resting areas, and even breeding grounds for your fish.
  • Benefits of live plants: Live plants not only enhance the visual appeal of your tank but also help maintain water quality by absorbing nitrates and producing oxygen. They can also provide natural filtration, reduce algae growth, and create a more stable environment for your fish.
  • Aquascaping: Arrange plants, rocks, and driftwood in a visually pleasing and functional manner, taking into consideration the swimming and hiding preferences of your fish species. Be mindful not to overcrowd the tank, as your fish need open swimming space to thrive.
  • Maintenance: Regularly trim and prune your plants to prevent overgrowth and maintain a balanced, healthy environment for your fish. Remove any dead or decaying plant matter to keep your tank clean.

Tips for Success

To ensure a thriving 3-gallon tank, follow these best practices:

  • Regular water changes: Perform partial water changes (20-30%) at least once a week to maintain optimal water quality and remove excess waste and toxins.
  • Testing water parameters: Regularly test water parameters, such as ammonia, nitrite, nitrate, and pH, to ensure a stable and healthy environment for your fish. Make necessary adjustments to keep these parameters within the acceptable range for your chosen species.
  • Observe fish behavior: Monitor your fish daily to identify any changes in behavior, appetite, or appearance that may indicate stress, illness, or injury. Address any issues promptly to prevent complications.
  • Quarantine new fish: Before adding new fish to your tank, quarantine them for at least two weeks in a separate tank to ensure they are healthy and free of diseases or parasites that could affect your existing fish population.
  • Avoid overstocking: Resist the temptation to add too many fish to your small tank. Overstocking can lead to stress, poor water quality, and increased risk of disease.

By following these tips and providing appropriate care, you can enjoy a successful and fulfilling experience with your 3-gallon fish tank.

Frequently Asked Questions

What are the best type of fish for a 2.5 or 3-gallon fish tank?

Click here to see my article on the best fish for a 3-gallon fish tank.

What Is the Best 3-gallon fish tank?

The best fish tank is one that is able to provide a comfortable and safe environment for your fish. Tetra LED cube kitis my top pick for the best 3-gallon fish tank. Indoor Aquaponic Garden and Fishtank is a great option for a self-cleaning system. This easy to maintain fish tank will provide your fish with a clean and healthy environment.

The Koller 360 aquarium is also one of the best 3-gallon fish tanks on the market. It comes with 7 different LED lightings, which makes it perfect for a variety of fish. The tank is also made of impact-resistant plastic, which makes it durable and long-lasting.

How often should I clean my 3-gallon fish tank?

You should clean your 3-gallon fish tank every two weeks. This will help to keep the water quality high and prevent algae from building up. However, you should also perform a test on the ammonia and pH levels every week to make sure that the levels are within the optimal range for your fish.

How many fish can I keep in a 3-gallon fish tank?

It is recommended that no more than three small (1-inch) fish be kept in a 3-gallon fish tank. The 1 inch per 1-gallon rule is a guideline for how many fish can be safely kept in a fish tank. This rule takes into account the size of the fish and the amount of water they need to stay healthy. However, it is important to note that this is a guideline and not a hard and fast rule.