Top 10 Best Fish Species for a 5 Gallon Tank

Creating a captivating aquarium in a compact 5-gallon tank has become increasingly popular. However, choosing the right fish species for such limited spaces requires careful consideration.

Join us as we dive into the world of small-scale aquatics and discover the top 10 best fish species that are perfectly suited for your 5-gallon tank, bringing tranquility, beauty, and a touch of nature into your living space.

Why you should choose a 5-Gallon Tank in the First Place?

In the fish keeping community, everyone just prefers a bigger tank, and every experts recommends having huge fish tanks. That’s great and a very good recommendation but there are times, when you will need a smaller tank.

While larger tanks offer more space and flexibility, there are several reasons why someone might choose a 5-gallon fish tank:

1. Space Constraints: A 5-gallon tank is compact and takes up less physical space, making it suitable for smaller living areas or limited countertop or desk space. It’s a great option for those who want to enjoy the beauty of an aquarium without dedicating a significant amount of room.
2. Ease of Maintenance: Smaller tanks are generally easier to maintain compared to larger ones. They require less water volume, making water changes and cleaning more manageable. Filtration systems and heating equipment for 5-gallon tanks are also typically more affordable and easier to maintain.
3. Affordability: Setting up and maintaining a 5-gallon tank is usually more budget-friendly compared to larger tanks. The cost of equipment, decorations, and fish themselves tends to be lower, making it a more accessible option for beginners or those on a tight budget.
4. Suitable for Small Fish Species: Some fish species naturally thrive in smaller environments. A 5-gallon tank provides a sufficient space for certain nano or dwarf fish species, allowing them to exhibit their natural behaviors and flourish within a confined setting.
5. Educational Value: A 5-gallon tank can be an excellent educational tool, especially for children or students. It offers an opportunity to learn about aquatic ecosystems, fish behavior, and responsible pet care, all in a more manageable and controlled environment.

It’s important to note that a 5-gallon tank has limitations, and not all fish species are suitable for such small spaces.

Top 10 Best Fish Species for a 5 Gallon Tank

Here is a list of the top 15 best fish species that are suitable for a 5-gallon tank

1. Betta Fish

• Size: Up to 2.5 inches (6 cm – 7.5 cm)
• Tank Size: 5 gallons or more
• Care Level: Moderate
• Temperature: 75-82°F (24-28°C)
• Diet: High-quality pellets, occasional live or frozen food
• Schooling: Solitary fish, should not be kept with other Betta males.

I have always been captivated by the vibrant beauty and graceful nature of Betta fish. These marvelous creatures, also known as Siamese fighting fish, have stolen the hearts of many hobbyists with their stunning colors and flowing fins.

These marvelous creatures are native to the rice paddies and slow-moving streams of Southeast Asia, where they thrive in warm, shallow waters.

To replicate their natural environment, it’s essential to provide them with a proper tank setup. A spacious aquarium with a capacity of at least 5 gallons is ideal, as it allows them ample space to swim and explore.

Water quality is of utmost importance when it comes to Betta fish care. They are tropical fish, requiring a consistent water temperature between 76-82°F (24-28°C).

A submersible heater and a thermometer are essential tools to maintain a stable and comfortable environment. Additionally, regular water changes of 25-30% every week, using a dechlorinator to remove harmful chemicals, are crucial for their well-being.

Another vital aspect of Betta fish care is filtration. While they can tolerate low water flow, it’s crucial to provide gentle filtration to maintain water quality. A sponge filter or a low-flow filter designed specifically for Betta fish is recommended. Strong currents can stress them and damage their delicate fins, so be mindful of their swimming capabilities.

These captivating creatures are carnivorous and thrive on a diet primarily consisting of high-quality pellet or flake food specifically formulated for Betta fish. It’s essential to feed them small portions two to three times a day, ensuring they consume their food within two minutes to prevent overeating.

Additionally, supplement their diet with frozen or live foods like brine shrimp, daphnia, or bloodworms to provide essential nutrients and enrichment.

2. Chili Rasboras

• Size: Chili Rasboras reach about 0.6 inches (1.5 centimeters) in length.
• Minimum tank size: 5 gallons
• Temperament: They are peaceful and non-aggressive.
• Schooling: They thrive in groups of at least six individuals.
• Care level: Moderate; stable water parameters and appropriate tank conditions are important.
• Temperature: Prefer 75°F to 82°F (24°C to 28°C).
• Diet: Omnivorous; feed high-quality flakes, micro pellets, and small live/frozen foods.

These tiny fish, also known as Mosquito Rasboras, have quickly become one of my favorites due to their striking appearance and peaceful behavior.

These fish are native to the acidic blackwater streams of Southeast Asia, so it is crucial to replicate their natural habitat in the aquarium. I maintain a well-planted tank with ample hiding places and dim lighting.

Remember that they thrive in clean water aquariums. The water should be soft, slightly acidic, and kept at a temperature between 75°F and 82°F (24°C to 28°C). Prefer using a sponge filter to provide gentle water flow and maintain pristine water conditions.

Despite their small size, Chili Rasboras have big personalities. They are peaceful and thrive in small shoals of at least six individuals. However, due to their small size, it is important to avoid housing them with larger, more aggressive tankmates who might view them as a potential snack.

They are omnivorous and will readily accept high-quality flake food, as well as small live or frozen foods like daphnia, brine shrimp, and micro worms. I find that a varied diet enhances their colors and overall health.

Regular water changes are crucial for the well-being of Chili Rasboras. These sensitive fish require stable water conditions, so I perform weekly water changes of around 20% to maintain optimal water quality.

3. Dwarf Gourami

• Size: 2-3 inches (5-7.5 cm)
• Tank Size: 5 gallons or more
• Care Level: Easy
• Temperature: 76-82°F (24-28°C)
• Diet: High-quality flakes, pellets, freeze-dried or frozen food
• Schooling: Can be kept in pairs but avoid multiple males together.

These vibrant and charismatic fish make a beautiful addition to any aquarium, and their unique personalities never fail to captivate me.

They thrive in tanks of at least 5 gallons, densely planted with floating vegetation like water lettuce or Indian ferns to provide shade and cover.

It’s essential to maintain a consistent water temperature between 76°F and 82°F (24°C-28°C) and a pH level around 6.0-7.5.

Ample filtration and regular water changes are necessary to keep the water quality pristine.

4. Dwarf Pea Puffer

• Size: Dwarf Pea Puffers grow up to 1 inch (2.5 cm) in length.
• Tank Size: Minimum 5-gallon (19-liter) tank is recommended.
• Temperament: Can be aggressive, choose tankmates carefully.
• Schooling: Not a schooling fish, they are solitary.
• Care Level: Moderate care required, need attention to water quality.
• Temperature: Prefer 76-82°F (24-28°C) tropical range.
• Diet: Carnivorous, feed on small invertebrates, offer live/frozen foods.

These little aquatic wonders require specific attention to ensure their well-being, making the experience both challenging and rewarding.

When it comes to caring for Dwarf Pea Puffers, maintenance is vital. Be not fooled by their cute appearance as these little fishes are pretty aggressive.

Despite their small size, Dwarf Pea Puffers possess a feisty nature. It’s crucial to choose tankmates carefully, opting for non-aggressive species that can coexist peacefully.

Creating a suitable tank setup is another aspect to prioritise. With a minimum tank size of 5 gallons, aim to mimic their natural habitat. Lush live plants, caves, and hiding spots provide a sense of security for my puffers.

Maintaining a stable temperature within the tropical range of 76-82°F (24-28°C) ensures their comfort.

As carnivores, Dwarf Pea Puffers thrive on a diet of live or frozen foods. Provide them with a varied menu, including bloodworms, brine shrimp, and daphnia. This helps meet their nutritional needs and keeps them active and vibrant.

5. Honey Gourami

• Size: 2-3 inches (5-7.5 cm) in length.
• Minimum Tank Size: 5 gallons for a pair or small group.
• Temperament: Peaceful, suitable for community tanks.
• Schooling: Can be kept in small groups of 4-6 individuals.
• Care Level: Hardy and easy to care for.
• Temperature: 75-82°F (24-28°C).
• Diet: Omnivorous, flake/pellet foods supplemented with live/frozen options.

Honey Gouramis, scientifically known as Trichogaster chuna, are popular freshwater fish among aquarists due to their vibrant colors, peaceful nature, and relatively easy care requirements.

First and foremost, providing an appropriate environment is crucial. A well-maintained aquarium with a minimum capacity of 5 gallons is recommended for a pair of Honey Gouramis and not more than that.

Maintaining a stable water temperature between 75-82°F (24-28°C) and a pH level around 6.0-7.5 is ideal.

When it comes to feeding, Honey Gouramis are omnivorous. They will readily accept a varied diet consisting of high-quality flake or pellet food, supplemented with live or frozen foods like brine shrimp, daphnia, or bloodworms.

Honey Gouramis are generally peaceful and can coexist with other peaceful community fish. They are best kept in pairs or small groups to prevent any single fish from becoming too stressed or isolated.

Honey Gouramis are stunning, peaceful fish that bring beauty to any community aquarium. With the right care, appropriate environment, and a balanced diet, they can thrive and exhibit their charming behavior.

6. Guppy

• Size: 1.5-2 inches
• Minimum tank size: 5 gallons
• Temperament: Generally peaceful, but males can be aggressive with each other
• Schooling: Prefer to be kept in groups of 4-6+
• Care level: Easy to care for, adaptable to different water conditions
• Temperature: 72-82°F (22-28°C)
• Diet: Omnivorous, flake/pellet food with occasional live/frozen supplements

Guppies, also known as million fish or rainbow fish, are one of the most popular and colorful aquarium fish species. These small, tropical freshwater fish are native to South America but have been successfully bred and kept in aquariums worldwide.

Guppies are known for their vibrant colors, unique patterns, and graceful swimming movements, making them a delightful addition to any aquarium.

In terms of temperament, guppies are generally peaceful and sociable fish. However, it’s important to note that male guppies can be territorial and may display aggression towards one another, especially if kept in cramped quarters.

When it comes to caring for guppies, there are a few key factors to consider. Firstly, they require a well-maintained aquarium with clean, properly conditioned water.

Regular water changes and filtration are essential to keep the water parameters stable and provide a healthy environment for the fish. The ideal temperature for guppies ranges from 72 to 82°F (22 to 28°C), and a pH level between 6.8 and 7.8 is generally suitable.

Guppies are relatively easy to feed as they are omnivorous. A varied diet consisting of high-quality flake or pellet food, supplemented with occasional treats like brine shrimp or daphnia, will ensure their nutritional needs are met. It’s important not to overfeed guppies, as it can lead to health issues and poor water quality.

Guppies are beautiful and easy-to-care-for fish that can thrive in a well-maintained aquarium. By providing a suitable environment, a balanced diet, and monitoring their well-being, guppy enthusiasts can enjoy the vibrant colors and lively nature of these fascinating fish.

7. Clown Killifish

• Size: Small, about 1.5-2 inches.
• Tank size: Minimum 5 gallons.
• Temperament: Generally peaceful.
• Schooling: Can be kept in small groups.
• Care level: Easy, suitable for beginners.
• Temperature: 72-79°F.
• Diet: Carnivorous, eat flakes, bloodworms, brine shrimp.

Native to Africa, particularly regions of Nigeria and Cameroon, this species is known for its striking colors and interesting behavior.

Clown Killifish are relatively small, with males growing up to 1.5 inches (3.8 cm) in length, while females are slightly larger, reaching around 2 inches (5 cm).

Due to their small size, they can comfortably live in small to medium-sized tanks.

Regarding temperament, Clown Killifish are generally peaceful and can be kept in a community tank with other small, non-aggressive fish. However, it is important to note that male Clown Killifish can become territorial during breeding, so providing ample hiding places and plants in the tank is crucial to create separate territories and minimize aggression.

While Clown Killifish are not schooling fish, they do exhibit shoaling behavior. It is recommended to keep them in groups of at least three to five individuals to promote a sense of security and reduce stress.

They can adapt to a wide range of water parameters, but it is important to maintain stable water conditions. The water temperature should be kept between 72°F and 82°F (22°C to 28°C), and the pH level should be slightly acidic to neutral, ranging from 6.0 to 7.5.

When it comes to their diet, Clown Killifish are omnivorous. They will accept a variety of foods, including high-quality flakes, pellets, frozen or live foods such as brine shrimp, daphnia, and small insects.

8. Mollies 

• Size: 3 to 4 inches (7.5 to 10 cm)
• Minimum tank size: 5 gallons
• Temperament: Generally peaceful, but males can be aggressive
• Schooling: Prefer companionship but not tight schools
• Care level: Relatively easy to care for
• Temperature: 72°F to 82°F (22°C to 28°C)
• Diet: Omnivorous, feed flakes/pellets and supplement with live/frozen foods

Clown Killifish, scientifically known as Epiplatys annulatus, are small and colorful freshwater fish that are popular among fish keepers. Native to Western Africa, these fish are named for their vibrant and eye-catching patterns, resembling clowns.

In terms of size, Clown Killifish are relatively small, with males growing up to 1.5 inches (3.8 cm) and females slightly larger, reaching about 2 inches (5 cm) in length.

A tank size of 5 to 10 gallons (19 to 38 liters) is generally sufficient to accommodate a small school of Clown Killifish.

Clown Killifish are generally peaceful and non-aggressive, making them suitable for community tanks. However, they can display some territorial behavior, especially during breeding.

Care for Clown Killifish is relatively easy, making them suitable for beginner fish keepers. They are hardy fish and can tolerate a wide range of water conditions. Maintaining a stable water temperature between 72°F and 77°F (22°C to 25°C) is ideal for their well-being.

In terms of diet, Clown Killifish are omnivorous and have a preference for small live or frozen foods. Their diet can include brine shrimp, daphnia, mosquito larvae, and high-quality flake or pellet food designed for small fish.

9. Neon Tetras 

• Size: Around 1.5 inches (4 cm)
• Minimum tank size: 5 gallons
• Temperament: Peaceful and non-aggressive
• Schooling: Thrive in groups of at least six or more
• Care level: Relatively easy to care for
• Temperature: 72°F to 78°F (22°C to 26°C)
• Diet: Omnivorous, feed high-quality flakes, pellets, and small live/frozen foods

Neon Tetras, scientifically known as Paracheirodon innesi, are small and captivating freshwater fish that are highly sought after by fish keepers. Originating from the Amazon basin in South America, these fish are renowned for their stunning iridescent blue and red coloration.

Neon Tetras are relatively small fish, reaching an average size of around 1.5 inches (3.8 cm) in length. Due to their small size, they can be comfortably housed in smaller aquariums.

They are known for their calm nature and can be kept in community tanks with other small, non-aggressive fish.

They thrive when kept in groups of at least six individuals or more. The presence of a school provides them with a sense of security and reduces stress levels.

They have a moderate care level and can adapt to a range of water conditions. However, it’s important to maintain stable water parameters. The ideal temperature for Neon Tetras is between 72°F and 78°F (22°C to 26°C).

They have a preference for small-sized foods such as small live or frozen invertebrates, micro-pellets, and high-quality flake foods.

10. Ember Tetras

• Size: 1 inch
• Minimum Tank Size: 5 gallons
• Temperament: Peaceful
• Schooling: Prefer groups of 6+
• Care Level: Easy
• Temperature: 72°F – 80°F
• Diet: Omnivorous (flakes, pellets, live/frozen foods)

These charming little fish are a popular choice among aquarists due to their vibrant colors and peaceful nature.mber

Tetras are small but stunning creatures that can grow up to a maximum size of about 1 inch (2.5 centimeters).

Their petite size adds to their appeal, making them suitable for both small and large aquarium setups. Therefore, makes it a perfect fit for a 5 Gallon tank.

They thrive in community tanks and get along well with other non-aggressive fish species. To see Ember Tetras at their best, consider keeping them in a small school of at least six individuals.

These little beauties prefer slightly warmer water temperatures ranging from 72 to 82°F (22 to 28°C). It’s important to provide them with a heater to maintain a consistent temperature within their preferred range.

When it comes to their diet, Ember Tetras are omnivorous. They have a small mouth, so it’s best to provide them with small-sized food, such as high-quality flakes or micro pellets. Additionally, they enjoy occasional treats of live or frozen foods like daphnia or brine shrimp.