20 Best Freshwater Fish for 55-Gallon Tanks

Discover which are the perfect freshwater fish species for a 55-gallon tank. In this guide, we compare various fish species based on their requirements, feeding habits, lifespan, and behavior, so you can make the right decision when choosing fish for your tank.

by Fabian

Updated: June 1, 2023 / 15 mins read

Fabian is the dedicated Chief Editor at Aquarium Nexus. From a young age, he was captivated by the vibrant world of aquatic life, leading him to accumulate over 20 years of experience in keeping and breeding various fish species. The fulfillment derived from the aquarium hobby has remained a constant throughout Fabian's life. As an expert in the field, he finds great pleasure in imparting his extensive knowledge and personal experiences to both seasoned aficionados and budding enthusiasts.

Discus Fish

The Discus Fish, with its striking colors and majestic appearance, is often called the “king of the aquarium.” Hailing from the Amazon River, it can be a demanding, yet rewarding fish to care for.

• Tank Size: 55 gallons (208 liters) minimum
• Care Level: Intermediate to Expert
• Adult Size: 6-8 inches (15-20 cm)
• Temperature: 82-86°F (28-30°C)
• Diet & Feeding: Carnivore, prefers high-quality frozen or live foods
• Lifespan: Up to 10 years
• Behavior: Peaceful, but may be territorial or aggressive when breeding

Discus does well with similarly-sized, peaceful tankmates, and they thrive in heavily planted environments. Consistent water quality and a proper diet are essential to maintain their overall health.

Angelfish

Angelfish are elegant and captivating freshwater species, known for their unique vertical swimming style and beautiful elongated fins. These fish are a popular choice for many aquarium hobbyists.

• Tank Size: 55 gallons (208 liters) minimum
• Care Level: Beginner to Intermediate
• Adult Size: 6 inches (15 cm)
• Temperature: 75-82°F (24-28°C)
• Diet & Feeding: Omnivore, accepts a variety of flake, pellet, frozen, and live foods
• Lifespan: 10-15 years
• Behavior: Generally peaceful, but can be territorial or semi-aggressive during breeding

Angelfish are best kept in a tall, planted tank with plenty of hiding spaces. Although they can coexist with other peaceful fish, it’s essential to avoid fin-nipping species or those small enough to be mistaken for food.

Bala Shark

Bala Sharks, despite their name, are not true sharks but rather energetic and captivating freshwater fish, known for their metallic sheen and torpedo-shaped body. They make a stunning addition to larger tanks.

• Tank Size: 150 gallons (568 liters) minimum, as they can outgrow a 55-gallon tank
• Care Level: Beginner to Intermediate
• Adult Size: 10-12 inches (25-30 cm)
• Temperature: 72-82°F (22-28°C)
• Diet & Feeding: Omnivore, appreciates a variety of flake, pellet, frozen, and live foods
• Lifespan: 8-10 years
• Behavior: Peaceful and active, prefers to be in a school of 5 or more

Though Bala Sharks can start in a 55-gallon tank, they require a larger tank as they grow. They enjoy swimming space and usually get along well with other peaceful, similarly-sized fish. A well-planted tank with hiding spots is ideal for their well-being.

Electric Blue Acara

The Electric Blue Acara is known for its striking blue coloration and friendly temperament, making them a favorite among aquarium enthusiasts. These attractive cichlids are an excellent choice for a community tank.

• Tank Size: 30 gallons (113 liters) minimum, but 55 gallons (208 liters) recommended for greater swimming space
• Care Level: Beginner to Intermediate
• Adult Size: 6-7 inches (15-18 cm)
• Temperature: 76-80°F (24-27°C)
• Diet & Feeding: Omnivore, enjoys various flake, pellet, frozen, and live foods
• Lifespan: 8-10 years
• Behavior: Generally peaceful and social, may display territorial behavior during breeding

The Electric Blue Acara prefers a well-planted tank with hiding spots, like caves or rocks. They typically coexist with other peaceful, similarly-sized fish, making them a great addition to a 55-gallon community aquarium.

Clown Loach

Clown Loaches are attractive, playful, and energetic bottom-dwelling fish, adored for their bright orange and black stripes. They bring life to the lower regions of an aquarium.

• Tank Size: 100 gallons (378 liters) minimum, as they can outgrow a 55-gallon tank
• Care Level: Intermediate
• Adult Size: 10-12 inches (25-30 cm)
• Temperature: 75-81°F (24-27°C)
• Diet & Feeding: Omnivore, relishes a mix of pellets, flakes, frozen, and live foods
• Lifespan: 10-15 years
• Behavior: Active and social, prefers to live in groups of 5 or more

Clown Loaches can start in a 55-gallon tank but will eventually require a larger tank as they grow. They love hiding spots and plants, as well as a sandy bottom. These fish may coexist with other peaceful tankmates, and they help control snail populations as well.

Blood Parrot Cichlid

Blood Parrot Cichlids, a hybrid species, have gained popularity due to their unique shape and bright colors. They can be a quirky and personable addition to your tank.

• Tank Size: 30 gallons (113 liters) minimum, but 55 gallons (208 liters) is ideal for more space
• Care Level: Intermediate
• Adult Size: 6-8 inches (15-20 cm)
• Temperature: 76-80°F (24-27°C)
• Diet & Feeding: Omnivore, prefers cichlid pellets, flakes, and occasional live or frozen foods
• Lifespan: 10-15 years
• Behavior: Generally peaceful, but may exhibit occasional aggression or territorial behavior

Blood Parrot Cichlids appreciate a well-decorated tank with caves, rocks, and plants. They generally get along with other peaceful fish of a similar size. Proper filtration and water conditions are crucial to ensure their long-term health.

Boeseman’s Rainbowfish

Boeseman’s Rainbowfish, known for their stunning color gradients and active swimming, are perfect for adding a vibrant touch to your aquarium.

• Tank Size: 30 gallons (113 liters) minimum, but 55 gallons (208 liters) is ideal for more space
• Care Level: Intermediate
• Adult Size: 4-6 inches (10-15 cm)
• Temperature: 72-79°F (22-26°C)
• Diet & Feeding: Omnivore, enjoys flake, pellet, live, and frozen foods
• Lifespan: 5-8 years
• Behavior: Peaceful and active, school forming

Boeseman’s Rainbowfish thrive in groups of 6 or more and prefer a well-planted tank with plenty of swimming space. They’re a fantastic choice for a community aquarium, coexisting well with other peaceful tankmates of similar size. It’s essential to maintain stable water conditions and a varied diet to ensure their well-being.

Severum

Severum, a beautiful and friendly cichlid species, can bring character and color to any freshwater aquarium. They are native to South American rivers and lakes.

• Tank Size: 55 gallons (208 liters) minimum
• Care Level: Intermediate
• Adult Size: 6-8 inches (15-20 cm)
• Temperature: 75-84°F (24-29°C)
• Diet & Feeding: Omnivore, enjoys cichlid pellets, flakes, live, and frozen foods
• Lifespan: 8-10 years
• Behavior: Generally peaceful, may show territorial behavior during breeding

Severums prefer a spacious, well-planted tank with plenty of hiding places such as rocks, driftwood, and caves. They are compatible with other peaceful fish, although having tankmates closer to their own size is advisable. Stable water parameters and a balanced diet are essential to maintain their health and vibrant colors.

Flowerhorn Cichlid

Flowerhorn Cichlids, vibrant hybrid cichlids, are known for their unique appearance and vivid coloration. These gorgeous fish certainly draw attention.

• Tank Size: 75 gallons (284 liters) minimum, as they can outgrow a 55-gallon tank
• Care Level: Intermediate to Expert
• Adult Size: 12-16 inches (30-40 cm)
• Temperature: 80-86°F (27-30°C)
• Diet & Feeding: Omnivore, prefers pellets, live, and frozen foods
• Lifespan: 10-12 years
• Behavior: Aggressive and territorial, not recommended for a community tank

While a Flowerhorn may start in a 55-gallon tank, it will eventually require a larger space. They are best kept in a species-only tank to avoid confrontation with other fish. A well-decorated aquarium with hiding spots, strong filtration, and stable water conditions are essential for a healthy and happy Flowerhorn Cichlid.

Texas Cichlid

Texas Cichlids, known for their stunning patterns and large size, make an impressive centerpiece in a sizable aquarium. This beautiful North American species appeals to cichlid enthusiasts.

• Tank Size: 75 gallons (284 liters) minimum, to accommodate the fish’s size and territorial nature
• Care Level: Intermediate
• Adult Size: 12 inches (30 cm)
• Temperature: 70-75°F (21-24°C)
• Diet & Feeding: Omnivore, accepts cichlid pellets, flakes, live, and frozen foods
• Lifespan: 10-15 years
• Behavior: Aggressive, best in a species-only or tank with larger, robust tankmates

While Texas Cichlids can start in a 55-gallon tank, they will require larger accommodations as they mature. A spacious and well-decorated tank with sturdy plants, hiding spots, and a sandy substrate is necessary to ensure a comfortable environment for these stunning fish.

Jewel Cichlid

Jewel Cichlids are eye-catching fish noted for their vibrant red and blue speckles. This dazzling African species brings color and charm to a sizable tank.

• Tank Size: 40 gallons (151 liters) minimum, to provide ample space for this territorial species
• Care Level: Intermediate
• Adult Size: 5-6 inches (13-15 cm)
• Temperature: 75-80°F (24-27°C)
• Diet & Feeding: Omnivore, requires a mix of cichlid pellets, flakes, live, and frozen foods
• Lifespan: 5-8 years
• Behavior: Aggressive, particularly when breeding, and should be housed with similarly-sized, assertive fish

Jewel Cichlids thrive in a well-decorated aquarium with multiple hiding places, such as rocks and caves. Ample swimming space, stable water parameters, and a balanced diet are key factors in maintaining the health and vibrancy of these remarkable fish.

Denison Barb

Denison Barbs, known for their remarkable red lines and torpedo-shaped bodies, are active and engaging fish that bring life to any community aquarium.

• Tank Size: 55 gallons (208 liters) minimum for appropriate swimming space
• Care Level: Beginner to Intermediate
• Adult Size: 4-6 inches (10-15 cm)
• Temperature: 60-77°F (15-25°C)
• Diet & Feeding: Omnivore, loves a blend of flakes, pellets, live, and frozen foods
• Lifespan: 5-8 years
• Behavior: Peaceful and active, prefers to be in a school of 6 or more

Denison Barbs are ideal for a community tank with other peaceful fish, as they swim tirelessly and enjoy schooling with their companions. A well-planted aquarium with hiding spots and stable water parameters is essential for their well-being.

Green Terror

Green Terrors are alluring fish known for their metallic green coloration and distinctive striped pattern. This South American cichlid species can be challenging to keep, but it’s worth the effort.

• Tank Size: 75 gallons (284 liters) minimum, to accommodate their size and territorial nature
• Care Level: Intermediate to Expert
• Adult Size: 8 inches (20 cm) for females, 12 inches (30 cm) for males
• Temperature: 68-78°F (20-26°C)
• Diet & Feeding: Omnivore, prefers a variety of cichlid pellets, flakes, live, and frozen foods
• Lifespan: 7-10 years
• Behavior: Aggressive, best kept in a species-only tank or with larger, robust tankmates

Green Terrors require a spacious and well-decorated aquarium with plenty of hiding places, a sandy substrate, and sturdy plants. Consistent water quality, proper diet, and a suitable living environment are vital for keeping these vibrant fish healthy.

Jack Dempsey

Named after the famous boxer, Jack Dempsey fish are cichlids known for their intriguing appearance, featuring electric blue and violet spots. These stunning fish are native to Central and North America.

• Tank Size: 55 gallons (208 liters) minimum for sufficient swimming space
• Care Level: Intermediate
• Adult Size: 8-10 inches (20-25 cm)
• Temperature: 74-82°F (23-28°C)
• Diet & Feeding: Omnivore, prefers cichlid pellets, flakes, live, and frozen foods
• Lifespan: 8-10 years
• Behavior: Aggressive, best kept with larger, tough tankmates or in a species-only tank

Jack Dempsey fish need a well-decorated aquarium with hiding places, including rocks, caves, and driftwood. Consistent water quality, a proper diet, and careful tankmate selection are crucial for maintaining the health and well-being of these striking fish.

Firemouth Cichlid

Firemouth Cichlids, as their name implies, showcase brilliant red and orange colors around their throat and belly areas. These Central American fish are an attractive choice for cichlid enthusiasts.

• Tank Size: 30 gallons (113 liters) minimum, but 55 gallons (208 liters) is ideal for more space
• Care Level: Beginner to Intermediate
• Adult Size: 6 inches (15 cm)
• Temperature: 75-86°F (24-30°C)
• Diet & Feeding: Omnivore, accepts cichlid pellets, flakes, live, and frozen foods
• Lifespan: 10-15 years
• Behavior: Semi-aggressive, especially when breeding. Suitable for community tanks with similar-sized, robust fish

Firemouth Cichlids prefer a well-planted tank with ample hiding spots, like rocks and caves. They usually get along with other fish, although territorial behavior may occur during breeding. A proper diet and maintained water parameters will help keep these interesting fish healthy.

Red Tail Shark

Red Tail Sharks, with their striking black bodies and vibrant red tails, are a popular choice for aquarium hobbyists. These fish bring energy and contrast to the bottom of the tank.

• Tank Size: 55 gallons (208 liters) minimum for appropriate swimming and hiding space
• Care Level: Intermediate
• Adult Size: 5-6 inches (13-15 cm)
• Temperature: 72-79°F (22-26°C)
• Diet & Feeding: Omnivore, enjoys pellet, flake, live, and frozen foods
• Lifespan: 5-8 years
• Behavior: Semi-aggressive, territorial towards bottom-dwelling fish, but peaceful with upper-dwelling species

Red Tail Sharks require a well-decorated tank with hiding spots and plants. They can generally coexist with other smaller, peaceful fish; however, multiple Red Tail Sharks should be avoided in the same tank. Consistent water parameters and a varied diet contribute to their overall well-being.

Electric Yellow Cichlid

Electric Yellow Cichlids, also known as Yellow Labs, are a striking African cichlid species. Their bright yellow coloration can add a pop of color to any aquarium.

• Tank Size: 30 gallons (113 liters) minimum, but a 55-gallon (208 liters) is preferable
• Care Level: Beginner to Intermediate
• Adult Size: 5 inches (13 cm)
• Temperature: 75-82°F (24-28°C)
• Diet & Feeding: Omnivore, accepts cichlid pellets, flakes, and live or frozen foods
• Lifespan: 6-10 years
• Behavior: Generally peaceful, compatible with other African cichlids

Electric Yellow Cichlids thrive in an environment that mimics their natural Lake Malawi habitat. A rocky tank setup with caves, hiding spots, and stable water conditions will help these striking fish flourish. They are suitable for African cichlid community tanks.

Kribensis Cichlid

Kribensis cichlid, also known as the Rainbow Krib, is a beautiful and colorful African dwarf cichlid that makes a great addition to a community tank.

• Tank Size: 20 gallons (75 liters) minimum, but 55 gallons (208 liters) is ideal for a pair
• Care Level: Beginner to Intermediate
• Adult Size: 3-4 inches (8-10 cm)
• Temperature: 75-80°F (24-27°C)
• Diet & Feeding: Omnivore, enjoys a variety of pellets, flakes, live, and frozen foods
• Lifespan: 5-8 years
• Behavior: Peaceful when not breeding, can be territorial during breeding

Kribensis do well in a planted tank with plenty of hiding spots, such as rocks and caves. They are suitable for community tanks housing other peaceful fish of a similar size, but potential tankmates should be chosen carefully, especially during breeding times.

Oscar Fish

Oscar Fish, known for their intelligence and impressive size, are a favorite among cichlid enthusiasts. These South American fish add character and charm to a spacious tank.

• Tank Size: 75 gallons (284 liters) minimum to accommodate their size and feeding habits
• Care Level: Intermediate
• Adult Size: 12-14 inches (30-36 cm)
• Temperature: 74-81°F (23-27°C)
• Diet & Feeding: Carnivore, prefers a mix of cichlid pellets, live, and frozen foods
• Lifespan: 10-15 years
• Behavior: Semi-aggressive, compatible with other large fish or smaller, fast-swimming species

Oscar Fish require a large and well-decorated aquarium with ample hiding spots and a good filtration system. It’s essential to maintain water quality and a suitable diet to keep these fascinating fish healthy and thriving.

Siamese Algae Eater

Siamese Algae Eaters, known for their exceptional algae-consuming abilities, are a helpful addition to most freshwater tanks. These modest fish keep your aquarium clean and vibrant.

• Tank Size: 30 gallons (113 liters) minimum, but 55 gallons (208 liters) provides more swimming space
• Care Level: Beginner
• Adult Size: 6 inches (15 cm)
• Temperature: 75-79°F (24-26°C)
• Diet & Feeding: Omnivore, feeds on algae and requires additional pellets, flakes, and vegetables
• Lifespan: 5-7 years
• Behavior: Peaceful, prefers to live in small groups

Siamese Algae Eaters appreciate a well-planted tank with hiding spots and plenty of natural algae growth. They can easily coexist with various peaceful species in a community tank, helping to maintain a clean and healthy environment for themselves and their tankmates.

Best Way to Choose Fish for 55-Gallon Aquarium

When choosing fish for your 55-gallon aquarium, consider the fish’s size, temperament, and their compatibility with other fish species. Also, take into account the quantity of fish you plan to add to the tank.

Here are a few tips to help you choose the right fish for your 55-gallon tank:

• Research the fish species: Learn about different freshwater fish species, their size at adulthood, and their specific requirements, such as water parameters and diets.
• Consider the fish size: The size of your aquarium should dictate the type of fish you choose; ideally, opt for fish that grow to a maximum of 6 inches in length.
• Choose compatible species: Make sure your selected fish species get along and can coexist peacefully. Avoid putting aggressive fish with smaller, more peaceful species.
• Mind the bioload: Ensure your aquarium can handle the accumulated waste produced by the fish. Calculate your stocking levels accordingly.
• Add variety and color: Select various colorful fish species to create an aesthetically pleasing tank display.
• Ensure a healthy diet: Be prepared to accommodate the dietary requirements of each fish species in your tank.
• Plan for hiding spots: Some fish prefer secluded areas in the aquarium to reduce stress and avoid territorial disputes. Include plenty of hiding spots for your fish in the tank.

By following these tips, you can create a beautiful and thriving 55-gallon tank with a diverse community of freshwater fish. Now let’s explore the top 20 freshwater fish suitable for a 55-gallon aquarium.

Conclusion

Now you’ve discovered 20 fantastic freshwater fish options for your 55-gallon tank. Mix and match to create a harmonious aquatic world, and remember to consider compatibility, size, and care requirements. We’d love to hear about your experiences – share your thoughts in the comments!