Best Fish for Small Tank

Best Fish for Small Tank

Keeping an aquarium in your home can have many benefits for your well-being. Research proves It can help reduce stress levels and lower blood pressure. The good thing is fishes come in various colorful and unique species, making your aquarium lively and vibrant.

Hey, My name is Aly, and today we dive into your aquarium. Kidding, not in your aquarium, but for your aquarium. This blog will find the best fish for small tanks. We have many options, so why not check all of them? So let’s jump.

Neon Tetra

The Neon Tetra is one of the most popular freshwater fish on our list of best fish for small tanks. This tiny and slender fish is easy to care for, making it a great choice for new aquarium owners. Despite its small size, the Neon Tetra is a vibrant and colorful fish with a blue body and a stunning red stripe running down its side.

Neon Tetras don’t grow very large, reaching only about 2.2 cm in length. They are known for being a peaceful and quiet species, and they do best when kept in groups and in tanks with plenty of rocks, plants, and other decorations to hide in. The Neon Tetra is an excellent choice if you’re looking for a low-maintenance fish that adds a pop of color to your aquarium.


For beginner aquariums ones, Guppy is an excellent choice and the best fish for small tanks. They’re very easy to care for, but separating the males and females is important, or they may breed quickly.

Guppies come in various colors, with males being more brightly colored than females. These fish can adapt to different water conditions and have lively personalities, which makes them a popular choice among aquarium enthusiasts.

To keep your Guppies happy and healthy, it’s important to maintain a consistent water temperature in their tank, ideally around 50°F – 84°F (10-29°C). With proper care, your Guppies will thrive and add a lively and colorful element to your aquarium.


Mollies are a fantastic freshwater species that are small and easy to care for, it makes them the best fish for small tanks. These fish can grow up to 3 to 4 inches long and are omnivorous, meaning they can eat plants and other creatures. One cool thing about Mollies is that they give birth to live young, unlike other fish that lay eggs.

However, like Guppies, Mollies also love to breed, so separating the males and females is important if you don’t want a lot of baby fish in your tank. With their friendly and peaceful temperament, Mollies make great tank mates for other fish species. If you’re looking for a low-maintenance and entertaining freshwater fish for your aquarium, consider adding some Mollies to your collection.

Betta Fish

Betta Fish, also known as Siamese fighting fish, are another popular and best fish for small tanks. They come in various stunning colors and have a generally friendly demeanor…most of the time. However, it’s important to note that Betta fish are known for their territorial and aggressive behavior, especially towards other males.

If your Betta is calm enough, it can be kept in a large tank with other fish species. But avoid putting them in tanks with similar-looking fish, such as Guppies, to prevent potential fighting. It’s also important to set up their tank with substrate and plants to provide them with a comfortable and stimulating environment. With proper care and attention, Betta fish can be a beautiful and entertaining addition to your aquarium.


Goldfish are another extremely popular freshwater species that can make the best fish for small tanks. They have the potential to grow up to 14 inches long and, in some cases, can even live up to 25 years or longer! To keep your pet Goldfish happy and healthy, it’s important to provide them with a tank that is at least 20 gallons in size and requires regular maintenance, such as weekly water changes and filter cleaning.

Goldfish come in various shapes, sizes, colors, and breeds, making them a beautiful and diverse addition to your aquarium. With the proper care and attention, your Goldfish can thrive and live a long and happy life in their tank.

Angel Fish

Have you ever seen an Angelfish? These freshwater beauties are popular with fish enthusiasts, and it’s easy to see why! They can grow up to 6 inches long and 8 inches tall, making them a grand addition to any aquarium.

One of the best things about Angelfish is that they come in various colors and patterns, making each one unique. While they can eat plants and small creatures like bugs and shrimp, it’s important to note that they should not be housed with small fish.

These fish can sometimes be territorial and aggressive, although not as much as Betta fish. To keep them happy and stress-free, it’s best to keep them in a tank with just a few other fish. Angelfish are a stunning and interesting addition that makes them the best fish for small tanks, as long as you keep their temperament in mind. Give them the right environment, and you’ll enjoy their beauty for years to come!

Golden Dwarf Barbs

Golden Dwarf Barbs! These little fish may be lesser known, but they’re the perfect choice for new fish owners. These adorable guys can grow up to 1.5 inches long and are easily recognizable by their bright yellow color and distinctive black markings.

To keep them healthy and happy, it’s best to give them a tank with plenty of plants. And if you want to see them at their best, make sure to keep them in a group of at least five! So if you’re looking for a colorful and charming best fish for small tanks that’s easy to care for, give the Golden Dwarf Barbs a try!

Rainbow Fish

Have you heard of Rainbowfish? They’re a cool freshwater species that are pretty easy to care for. While their bright and beautiful colors may not fully develop until they’re all grown up, trust me when I say it’s totally worth the wait with some proper TLC.

One thing to note about Rainbowfish is that they can be a little shy but usually get along swimmingly with other fish in their tank, especially spikes and tetras. So if you want to add color and personality to your aquarium, consider these fun and friendly fish!

Zebra Danios

Looking for a perfect fish species for your first aquarium? Look no further than the Zebra Danios! These little and easy-to-care-for fish typically grow 5 to 7 cm in size. Since they are schooling fish, keeping them in groups is best to avoid stress.

Zebra Danios love to eat worms, bugs, and scavengers, and they can also be fed regular fish food, but we recommend adding some variety to their diet. Remember that these fish are known to jump out of tanks, so make sure to cover your tank securely.


Are you looking for a beautiful freshwater fish that is easy to care for? Meet the Platy fish! Platies stand out in any aquarium with their vibrant and varied colors. These peaceful fish thrive in community settings and are known to get along well with other species, like guppies and mollies.

Regarding their diet, Platies need a balance of plant-based and protein-rich foods, but they can also enjoy the occasional meaty treat. Don’t underestimate freshwater fish – they can be as flashy and colorful as their saltwater counterparts!

FAQs on Best Fish For Small Tank

A 5-liter tank is quite small and not suitable for most fish species. You could consider keeping a single Betta fish, also known as Siamese fighting fish, as they can tolerate small tanks. However, it’s important to note that even though they are small, they still need adequate space to swim, so a tank larger than 5 liters is preferable.

Similarly, a 2-gallon tank is too small for most fish species. If you insist on keeping fish in such a small tank, you could consider keeping a single male Betta fish, a few shrimp or snails, or a small group of guppies. However, like the 5-liter tank, a larger tank is preferable.

A 2-foot aquarium is a decent size, and you have more options to choose from. Some suitable fish species for this size tank include tetras, dwarf gouramis, corydoras catfish, and small rasboras. Just remember to research the specific requirements for each species and ensure they are compatible with each other.

If you want to keep multiple fish in a small tank, it’s important to choose species that are compatible with each other and won’t outgrow the tank. Some suitable small fish that can live together include neon tetras, cherry barbs, platies, and guppies. However, remember that you’ll need to provide adequate filtration and perform regular water changes to maintain good water quality.

Goldfish are notorious for producing a lot of waste and require a lot of space to swim. A single goldfish requires at least 40 liters of water, so five would need a minimum tank size of 200 liters. It’s important to note that goldfish can grow quite large and live for decades with proper care, so they are unsuitable for small tanks.

There isn’t necessarily a “king” of the aquarium, as different fish species have different needs and behaviors. Some popular and striking fish species often considered the “showstoppers” of a tank include angelfish, discus, and flower horns. However, it’s important to choose fish that are appropriate for your tank size and compatible with each other.

Freshwater fish can be a delightful addition to any aquarium, and with the right care and attention, they can thrive and live long lives. As a new aquarium owner, it’s important to take the time to learn about your fish’s unique personalities and needs.

You can create a beautiful and healthy environment for your freshwater fish to thrive in with patience and dedication. Remember to regularly maintain your aquarium and provide your fish with a balanced diet to keep them happy and healthy. With time, you’ll develop a deep affection for these beautiful and charming creatures!

Here, I covered everything on the best fish for small tanks and FAQs. If you have a different question, ask me in the comment box. And now, Explore some of the world’s most fascinating and bizarre animal species and how they challenge our perceptions of what it means to be an animal by visiting Mr. Danial’s post-Discover the World’s 5 Rudest Animals and leave a comment there; he will definitely want to know your opinion on that article 🙂

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