12 Of The Best Fish For A 7 Gallon Tank! (With Pictures)

Setting up a 7-gallon tank can be an exciting endeavor for aquarium enthusiasts, as it presents an opportunity to create a beautiful aquatic environment with an array of colorful species. While small in size, a well-maintained 7-gallon tank can be a thriving ecosystem, providing a rich habitat for certain fish species that are well-suited to these reduced spaces.

When selecting fish for a 7-gallon tank, it’s important to consider their size, behavior, and compatibility with other species. Smaller, peaceful fish make ideal candidates for such tanks, as they can live harmoniously with their tankmates and adapt well to tighter quarters.

Some popular stocking options include guppies, betta fish, tetras, or rasboras.

In addition to size and temperament, it is crucial to research each species’ environmental needs, such as temperature, water quality, and diet, to ensure a healthy and balanced tank. By keeping these requirements in mind while selecting fish for your 7-gallon tank, you can create a diverse, visually appealing, and harmonious underwater world that will continue to fascinate and captivate you.

6 Great Stocking Options For A 7 Gallon Aquarium Tank.png



Guppies, scientifically known as Poecilia reticulata, are an excellent choice for both beginner and experienced aquarium enthusiasts. These beautifully colored, lively, and low-maintenance fish have swiftly gained popularity in the fishkeeping hobby. In a 7-gallon tank, you can comfortably keep 1 to 5 guppies with ease.

To prevent breeding in such a small tank, it is usually better to keep an all male or all female tank of guppies if possible.

Male guppies tend to be more colorful and smaller than females, while female guppies are generally larger and less vibrant. As we covered in our guppy care guide, they thrive in a temperature range of 72-82°F with a pH level between 7 and 8. To maintain a clean and healthy environment for your guppies, make sure to have proper filtration and regular water changes.

Guppies are omnivorous, meaning they will eat both plant-based and animal-based foods. A balanced diet of high-quality flakes or pellets combined with occasional treats of live or frozen foods, such as brine shrimp or bloodworms, will keep your guppies healthy and colorful.

An infographic going over Great Food Sources For Guppies

In our opinion, a 7 gallon aquarium tank is too small to keep tank mates with your guppies so we would usually just recommend sticking with the 1 to 5 guppies. If you really want to add something else then 2 to 3 cherry shrimp can be a great option but anything else will usually overstock the tank.

In summary, guppies are beautiful, adaptable, and low-maintenance fish that can thrive in a 7-gallon tank when properly cared for and managed. With attention to their dietary needs, suitable tank mates, and maintaining a stable environment, your guppies will provide a delightfully colorful addition to your aquarium.

An infographic going over a guppy care sheet

Betta Fish

fish for 7 gallon tank
Betta Fish

Betta fish, also known as Siamese fighting fish, are a popular choice for aquarium enthusiasts due to their vibrant colors and unique appearance. A single betta fish can thrive in a 7-gallon tank, providing ample space for movement and exploration.

The ideal water parameters for a betta fish are a temperature of 78°F and a pH level of 7.0 or slightly more acidic. Maintaining these conditions will ensure the well-being of the betta and prevent stress-related illnesses developing.

In addition to water quality, betta fish require hiding spots and resting areas in their environment. Although it can be a little difficult in a small, 7 gallon tank, incorporating live plants, rocks, and ornaments in the tank will cater to their needs.

Hides And Sight Breaks For betta fish

There are a number of specialist betta fish food products on the market these days that help to maintain a healthy betta fish with very bright colors. They usually only cost a couple of dollars more than the generic fish flake or pellet products so we highly recommend them if you do keep a betta in your 7 gallon tank.

Being insectivores, betta fish love live, frozen or freeze-dried insects as treat foods too. Bloodworms, daphnia, brine shrimp, and mosquito larvae all work well with betta fish and help fill common nutritional holes in their diets.

Food for betta fish

A well-maintained 7-gallon tank can support a betta along with a few compatible tank mates. However, it is essential to monitor the behavior of the fish closely and be prepared to make adjustments if aggression or conflicts arise. With proper care and attention, a betta fish will flourish in a 7-gallon aquarium, enchanting observers with its captivating beauty.

An infographic going over a BETTA FISH CARE sheet

Neon Tetra

Neon Tetra
Neon Tetra

Neon Tetras are a popular choice for small aquariums due to their vibrant colors and peaceful nature. They are small, freshwater fish native to South America and belong to the family Characidae. Mature Neon Tetras typically grow to be around 1.5 inches long, making them a great option for a 7-gallon tank.

In a 7-gallon tank, it is viable for a group of 5-7 Neon Tetras to thrive, provided that proper care and tank conditions are maintained. These fish prefer slightly acidic water, with a pH ranging from 6.0 to 8.0, and a temperature between 72°F and 78°F. Adequate water filtration and regular maintenance are crucial to minimizing ammonia and nitrate levels, ensuring a healthy environment for the fish.

Neon Tetras are shoaling fish and feel more comfortable when living in groups. Maintaining a group of at least 5-7 individuals can help reduce their stress levels and enable them to exhibit their natural behaviors. It is essential to provide ample hiding spots and decorations, such as live plants, driftwood, and rocks, to mimic their natural habitat and offer them shelter.

A steadily increasing number of people are starting to mix different types of tetra that will school together as tank mates for this type of setup. This helps to increase the colors of the fish in the tank without causing any problems with the fish.

Here are the most commonly used types of tetra that are kept in tanks with neon tetras for a mixed setup:

  1. Cardinal Tetra (Paracheirodon axelrodi): These are similar in appearance to neon tetras but have more vibrant red coloring that extends along the entire lower body.
  2. Black Neon Tetra (Hyphessobrycon herbertaxelrodi): Despite the name, these fish are not closely related to the neon tetra but are still known to be peaceful and may school with them.
  3. Rummy Nose Tetra (Hemigrammus rhodostomus): Known for their red noses and distinctive tail stripes, rummy nose tetras can often be found schooling with neons.
  4. Ember Tetra (Hyphessobrycon amandae): Smaller and bright orange, ember tetras are a gentle fish that can mix well with neon tetras.
  5. Glowlight Tetra (Hemigrammus erythrozonus): These have a soft orange stripe, and they are quite peaceful.
  6. Green Neon Tetra (Paracheirodon simulans): Closely related to the regular neon, they have a similar appearance but with a greenish hue.
  7. Lemon Tetra (Hyphessobrycon pulchripinnis): Named for their pale yellow color, lemon tetras can be a good addition to a community tank with neon tetras.

If you are a beginner, we would highly recommend that you just stick to around six neon tetras in your 7 gallon tank to keep things as easy as possible.

Diet is another important aspect of maintaining healthy Neon Tetras. They are omnivores and should be fed a varied diet consisting of high-quality flake food, micro-pellets, and occasional live or freeze-dried treats such as brine shrimp and bloodworms. Feeding small amounts two to three times a day is generally recommended to prevent overfeeding and maintain water quality.

In summary, Neon Tetras are a beautiful and lively addition to a 7-gallon aquarium, provided that appropriate care, water quality, and tank conditions are maintained. With a harmonious group of these colorful fish, your aquarium can become an eye-catching display.

Zebra Danio

Zebra Danio
Zebra Danio

Zebra Danios are small, attractive, and active fish that are well-suited for a 7-gallon tank. In this size of the aquarium, it is possible to house a small group of 6 or 7 Zebra Danios comfortably. These fish are known for their beautiful blue and silver stripes, which create a striking visual effect as they swim around the tank.

They are schooling fish, so it is important to keep them in groups to maintain their social behavior and overall well-being. In a 7-gallon tank, however, it is recommended to focus on creating a comfortable environment solely for the Zebra Danios without adding any tank mates.

To keep Zebra Danios healthy and happy, proper water conditions must be maintained in the tank. They prefer a pH level of 7.0-7.4, hardness levels of 5-12°dGH, and a temperature range of 64-74°F. A well-filtered and aerated aquarium is also essential to ensure the water remains clean and oxygenated.

Pearl, Leopard, And Zebra Danios
Pearl, Leopard, And Zebra Danios

Just like neon tetras, you can mix different types of danio in the same tank and they will school together without issue changing up the patterns on your fish. Pearl, leopard, and zebra danios can all work well in a 7-gallon tank provided you keep the total number of fish below seven.

Zebra Danios are known for their active swimming behavior, so it is important to provide an environment that supports their energy levels. This includes having ample space to swim, as well as hiding spots like plants, rocks, and decorations for the fish to feel secure and explore.

This is why a horizontal, long 7 gallon tank is the best option for Zebra Danios with the plant and rock cover ideally at the rear of the tank leaving plenty of space for swimming.

Feeding the Zebra Danios a balanced diet is vital to their health. They are omnivorous and enjoy a variety of food sources such as high-quality flake food, live or freeze-dried brine shrimp, daphnia, and bloodworms. It is recommended to feed them small amounts of food several times a day to maintain their energy levels and prevent overfeeding.

In conclusion, Zebra Danios can make a great addition to a 7-gallon tank if cared for properly. By giving them proper water conditions, a well-maintained environment, and a balanced diet, they will surely thrive and provide enjoyment for their tank owner.

Celestial Pearl Danios

Celestial Pearl Danios
Celestial Pearl Danios

Celestial Pearl Danios, also known as Galaxy Rasboras, are a highly sought-after freshwater fish due to their striking appearance and manageable care requirements. Native to Southeast Asia, this small-bodied species adds a vibrant touch to any aquarium.

Tank Size: A group of 5 Celestial Pearl Danios can live well in a 7-gallon tank. This is an ideal size for creating a comfortable habitat for these fish, providing ample space for swimming and hiding spots with plants and decorations. This species usually require a minimum of 5 fish to school correctly, even in a small 7 gallon tank.

Appearance: These fish are characterized by their iridescent blue and white bodies, with distinctive pearl-like spots scattered across their sides. Their fins often exhibit orange or red hues, further enhancing their captivating appearance.

Behavior: Celestial Pearl Danios are known to be peaceful and timid, making them an excellent choice for community tanks. Although they may occasionally exhibit shy behavior, providing a well-planted environment with suitable hiding spots can help to alleviate any stress they may experience.

Care Requirements:

  • Temperature: Maintain a stable water temperature between 73°F and 79°F to ensure optimal living conditions for these fish.
  • Water Parameters: Aim for a pH of 6.5 to 8.4 and a water hardness of 5 to 10 dGH.
  • Diet: Offer a varied diet consisting of high-quality flake or pellet foods, as well as live or frozen options such as brine shrimp, daphnia, and bloodworms. This will contribute to their overall health and vibrant colors.

Unlike the pearl, leopard, and zebra danios covered in the previous section, we would not recommend adding other types of fish to a 7 gallon tank with Celestial Pearl Danios in it due to size constraints.

In summary, Celestial Pearl Danios are well-suited for a 7-gallon tank and can provide a stunning aquatic display with their vivid coloration and peaceful demeanor. Ensuring proper tank conditions, a balanced diet, and compatible tank mates will help these fish thrive in your aquarium.

Endler’s Livebearers

Endler's Livebearers
Endler’s Livebearers

Endler’s Livebearers (Poecilia wingei) are small, colorful freshwater fish that make an excellent choice for aquarium enthusiasts looking to populate a 7-gallon tank. Known for their vibrant appearance and relatively easy care requirements, these fish are well-suited for aquarists of all experience levels.

In a 7-gallon tank, it is advisable to keep four or six Endler’s Livebearers, as they are social fish that thrive in small groups. To avoid overcrowding, and to restrict breeding, it is best to stick with either an all-male or all-female tank.

Males of this species grow to about ¾-inch, while females are larger, reaching up to 1 to 1½ inches in size. The distinct color and size differences make it relatively simple to distinguish the sexes of these fish.

Endler’s Livebearers are versatile when it comes to water parameters, but they appreciate a well-maintained tank with a stable environment. A 7-gallon tank should include plenty of hardy plants, such as Java Fern and Java Moss, as these can tolerate the increased hardness often found in an Endler’s aquarium. Moreover, this provides the fish with hiding spots and contributes to their overall well-being.

Endler's Livebearers Thriving In Their Tank
Endler’s Livebearers

These fish are omnivores, which means they will require a balanced diet of both plant-based and meaty foods. Feeding them high-quality flakes and supplementing with frozen or live foods like brine shrimp and daphnia will ensure their health and bring out their vibrant colors.

In conclusion, Endler’s Livebearers are a captivating and relatively low-maintenance choice for a 7-gallon aquarium. By carefully managing the tank environment, maintaining a healthy group of the same sex, and ensuring compatibility with tank mates, aquarists can enjoy these fascinating fish and their brilliant colors.

Least Killifish

Least Killifish
Least Killifish

The Least Killifish (Heterandria formosa) is a suitable species for a 7-gallon tank. They are small-sized, active fish that are perfect for nano tanks. In a tank of this size, three or four Least Killifish can comfortably coexist.

Their ideal water conditions include a temperature range of 66-76°F and a pH level of 7.0-8.0. These fish are tolerant of water variations, making them suitable for beginner fish keepers. When setting up their tank, ensure appropriate filtration is present to maintain water quality.

A well-furnished tank environment is necessary for these fish to thrive. Providing bushy plants such as Water Wisteria, Guppy Grass, Hornwort, and Java Moss will ensure hiding spots and security for the adult Least Killifish as well as their fry. These plants also aid in reducing stress by allowing the fish to isolate themselves when needed.

When it comes to diet, Least Killifish are omnivorous, consuming a variety of food. A balanced mix of high-quality dry food, live, and frozen options such as brine shrimp, daphnia, and bloodworms will ensure their proper nutrition. It is important to feed them in small proportions to avoid overfeeding.

In summary, the Least Killifish is a suitable choice for a 7-gallon tank, and with proper care of water conditions, tank setup, diet, and compatible tank mates, they can make an interesting addition to a small aquarium.

Pygmy Corydoras

Pygmy Corydoras
“Corydoras pygmaeus” by Joel Carnat is licensed under CC BY 2.0. To view a copy of this license, visit https://creativecommons.org/licenses/by/2.0/?ref=openverse.

Pygmy Corydoras (Corydoras pygmaeus) are small, peaceful freshwater fish that make an excellent addition to a 7-gallon tank. In such a tank, you can comfortably house 4 to 6 of these tiny catfish, allowing them to thrive in the tank.

These fish are known for their small size, typically growing to only about 1 inch in length. They display an adorable and active swimming behavior, often seen swimming in groups near the bottom of the tank or occasionally in the middle.

When setting up a 7-gallon tank for Pygmy Corydoras, it is important to maintain water parameters within an appropriate range. Aim for a temperature between 72°F and 79°F, with a pH level of 6.0 to 8.0. As these fish are bottom dwellers, a sandy substrate is preferable, providing a gentle surface for them to search for food.

Adding plants and rocks to the tank not only creates a natural-looking environment but also gives the fish hiding spots, which they appreciate, especially when feeling threatened. To facilitate their swimming behavior, leave open swimming areas in the tank, while providing enough vegetation for them to explore and rest.

In terms of diet, Pygmy Corydoras are omnivorous and can be fed a variety of foods. Feeding a combination of high-quality sinking pellets, as well as freeze-dried or frozen foods, such as bloodworms and daphnia, will keep them well-nourished and ensure a balanced diet.

In conclusion, Pygmy Corydoras are a great choice for a 7-gallon tank. With the right environment, stable water parameters, and a mixed diet, these little fish will bring joy and activity to the aquarium.

Glowlight Tetra

Glowlight Tetra
Glowlight Tetra

Glowlight Tetras are a popular choice for small aquariums because of their attractive appearance and easy care requirements. These colorful fish are native to the waters of South America, particularly the Guyana River, where they enjoy a tropical environment. They are an excellent choice for a 7-gallon tank, providing that the setup is just right.

It is possible to keep six Glowlight Tetras in a 7-gallon tank, but aquarists must ensure that the proper conditions are met. The ideal water temperature for these fish ranges between 75°F and 82°F, and a well-maintained aquarium is vital.

To create an optimal environment for Glowlight Tetras in a 7-gallon tank, consider the following tips:

  • Filtration: Install a proper filtration system to ensure clean and healthy water for the fish. A power filter or sponge filter can be utilized for this purpose.
  • Plants and Decorations: Add live plants and hiding spots, such as rocks or driftwood. This helps mimic their natural habitat, providing the fish with a sense of comfort and security.
  • Lighting: Maintain a balanced lighting system, as Glowlight Tetras are sensitive to changes in light levels. Avoid placing the tank in direct sunlight.
  • Tank Mates: Choose peaceful, compatible tank mates like Cardinal Tetras, which are known to coexist well with Glowlight Tetras. Keep in mind that tank mates should also tolerate the same tank conditions and size limitations.

Keep in mind that the dietary requirements of these omnivorous fish include a variety of foods such as high-quality flakes, small pellets, and live or frozen foods like brine shrimp and daphnia. Feeding them a balanced diet will help maintain their vibrant colors and overall health.

In conclusion, Glowlight Tetras can be an excellent addition to a 7-gallon tank if set up correctly and provided with the necessary care. Their colorful appearance and lively nature will surely be a delightful sight for any aquarist.

Pea Puffer

Pea Puffer
Pea Puffer

Pea Puffers are an interesting and unique addition to a 7-gallon fish tank. Although a single adult pea puffer can be housed in a 7-gallon tank, it is essential to make sure the setup is perfect to meet their needs. Considering a baby pea puffer and then upgrading the tank as it grows may be a more suitable option.

These small freshwater fish are scientifically known as Carinotetraodon travancoricus. They are native to the Western Ghats of southwest India and can be found in rivers and lakes such as the Chalakudy River and Lake Vembanad. Keep in mind that pea puffers can be territorial and aggressive, particularly the males. It is important to ensure there’s an ample amount of hiding places and plants within the tank to mitigate their territorial behavior.

When it comes to water parameters, maintain a pH of 6.8 to 7.8, general hardness (GH) of 8 to 16, and carbonate hardness (KH) of 4 to 7. The water temperature should be within the range of 74 to 82°F for optimal health. Providing a well-filtrated and meticulously maintained environment is crucial for the pea puffer’s overall well-being.

Caring for a pea puffer also involves providing a diet that includes small live or frozen foods like brine shrimp, daphnia, and bloodworms, as their hunting instincts make them prefer live food sources.

In conclusion, pea puffers are a captivating choice for a 7-gallon fish tank when the appropriate setup and conditions are met. Ensuring a proper environment and diet, as well as anticipating changes necessary for growth or tank mates, will lead to a thriving and engaging addition to your aquarium.

Chili Rasboras

Chili Rasboras (scientific name: Boraras brigittae) are an excellent choice for a 7-gallon tank. They are nano fish, originating from southwestern Borneo in Indonesia. This species is not only visually stunning but also possesses playful personalities, making them a popular choice among fish enthusiasts.

In a 7-gallon tank, it is recommended to keep a small school of six Chili Rasboras. This will allow them to thrive in their environment since they are naturally a shoaling species, seeking the company of their own kind. Their vivid colors stand out even more when they are in a group, enhancing the overall aesthetics of your tank.

Chili Rasboras have a peaceful temperament, which allows them to coexist harmoniously with other small and non-aggressive fish. Some ideal tank mates for them include tetras, gouramis, cory catfish, pearl danios, and other Rasboras species. It’s essential to avoid housing them with large or aggressive fish, as it might pose a threat to their safety.

Caring for Chili Rasboras requires maintaining certain water conditions to ensure their health and well-being. The ideal water temperature for this species ranges from 72-81°F. A pH of 4.0-7.0 and a water hardness between 1-6 dH should also be maintained in the tank. As they mostly occupy the middle to upper areas of the aquarium, it is necessary to ensure that the water is adequately filtered and the flow rate is well-regulated.

Feeding Chili Rasboras is not a challenging task, as they are omnivorous and enjoy a variety of food sources. A balanced diet of high-quality pellets or flakes, coupled with frozen or live foods like brine shrimp, daphnia, or micro worms, will ensure they receive the proper nutrients.

In summary, a small school of six Chili Rasboras can live comfortably in a 7-gallon tank, provided that the water parameters are maintained and they are fed a balanced diet. These delightful nano fish will surely bring joy and beauty to your aquarium setup.

Cherry Shrimp

Cherry Shrimp
Cherry Shrimp

Cherry shrimp are an excellent choice for a 7 gallon tank. These colorful and hardy freshwater invertebrates can adapt well to a small aquarium environment, provided the conditions are right. They are easy to care for and make an attractive addition to any setup.

In a 7 gallon tank, it is recommended to start with at least ten cherry shrimp, as they adjust better in larger groups. For every three additional shrimp added, there should be another gallon of water. Cherry shrimp produce small amounts of waste, which makes it hard to overload a tank.

When it comes to water parameters, cherry shrimp prefer a temperature range of 57-86°F, with around 73°F being ideal. They can also tolerate a pH range of 6.5-8, and a GH of 6-8 dGH. It is important to maintain stable water conditions for these shrimp to flourish.

As omnivores, cherry shrimp feed on a variety of foods, including algae, biofilm, and prepared shrimp pellets. They are efficient at keeping the tank clean and can help maintain a healthy ecosystem.

Different types of shrimp for aquariums

If you don’t like the look of red cherry shrimp, you can keep any of the above shrimp species in your 7 gallon tank.

To create an environment where cherry shrimp can thrive, consider adding live plants and hiding spots within the tank. This will provide the shrimp with plenty of areas to explore, which can help reduce stress and encourage natural behaviors such as breeding.

In conclusion, cherry shrimp are an excellent option for a 7 gallon tank, offering vibrant colors, easy care, and compatibility with other small, peaceful tankmates. With proper water parameters, feeding, and tank setups, they can add beauty and functionality to your aquarium.

An infographic of a cherry shrimp care sheet

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