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Best Freshwater Aquarium Fish Combination

Thinking about the right fish combination for your aquarium is the first and wisest step to take while trying to grow your aquarium.

If you are a beginner, you should try not to overlook the basic factors concerning aquariums or you might end up having a bad experience which will surely lead to loss and a wasted investment. The most important factors to note are the cost and size of your aquarium.

Considering the best freshwater aquarium fish combination will help you get track of the fishes to keep and how to use take care of them. Here is a wide range of selected aquarium fish combinations to try out!

Best Freshwater Fish Combination List

  • Swordtail Koi Tricolor
  • Tetra Cardinals Medium
  • Harlequin Rasboras
  • Swordtail Red Velvet
  • Betta Splendens Siamese
  • Serbia Corydoras Cory Catfish
  • Blue German Ramirezi Cichlid
  • Black Molly

Swordtail Koi Tricolor

Best Freshwater Aquarium Fish Combination

The swordtails are a freshwater fish species in high demand and Kori tricolor has become the favorites of many home aquarium keepers.

They are also very active, with the males growing as long as 9cm, the females grow much bigger and at a length of 12cm.

The swordtails have reddish and white stripes, they have a transparent attractive body that you would always admire. They eat anything suitable for them ranging from algae to brine shrimp.

Aquarium Habitat

The perfect environment for the Swordtail koi is an aquarium of a PH of 8 levels, a temperature of 26 celsius, and a size of 10 gallons. This species is peaceful and can live with the non-aggressive fish.

Breeding Condition

These pretty Swordtails reproduce already swimming babies, you should remove the babies immediately from the adults or they will end up becoming a splendid meal for them.

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The environment for breeding should be a temperature of about 78(Fahrenheit). Check out the PH, ammonia, and KH levels to ensure their safety.

The fish are also very productive breeders s the reproduce monthly, the males can be aggressive so it would the best choice for you to minimize their number in your aquarium, sure you will not want to have so many bullies in your aquarium.

Swordtails can reproduce even in the absence of the males; the females store the sperm cells inside them so they can fertilize their eggs. They are tough fish and can look after themselves when there are bigger fish. But you shouldn’t keep them with fish that can eat them.

Tetra Cardinals Medium

Best Freshwater Aquarium Fish Combination

These are interesting freshwater aquarium you can find. They possess a trait of bright blue strips thorough out their body length.

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Below the pretty bright blue stripes are red stripes that also are striped on their bodies. This trait distinguishes them from the Neon Tetra- similar species in the family.

Aquarium Habitat

Some species would prefer suitable vegetation in their usual habitat. Your aquarium should have good plants and low light; this will help duplicate their natural aquarium environment. The fish is tough, but the perfect water conditions for the aquarium should be acidic and soft.

The Tetra Cardinal are a school fish they love been together and can be aggressive to other friendly fish.

Aquarium mates for several other tetra species like the Rasboras and Danios are the Paracheirodon axelrodi.

Breeding Condition

The Tetras need soft water for breeding and require a PH of 6. The females can lay more than 90 eggs, it will take just 24 hours for the eggs to hatch and a minimum of 5 days to start swimming around the aquarium like the others.

The brine shrimp is the best food for the baby tetras. The adults can be too choosy; they will accept a wide range of foods such as flake foods and blood worms.

Harlequin Rasboras

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The Harlequin Rasboras are attractive; they are lively freshwater fish. A school of these species will make a naturally colorful vibrant aquarium.

These fish are mainly freshwater species, they love low light with a wide space for swimming and dense vegetation.

Aquarium Habitat

The ideal aquarium water temperature should be between 75 and 77(degrees Fahrenheit). PH of 6.4 perfect when they are in school, they are friendly and you can’t find them aggressive to other fish.


These fish are not quite choosy when it comes to food, just like others they would eat brine shrimp, flakes, and any other fish live food.

Breeding Condition

Harlequins have a breed challenge but it’s possible for them during fair conditions, you will need to select the babied that you give live foods to consume before trying to spawn.

The water should not be too hard (not exceeding 2 d GH), and the temperature should be 80 (degrees .F.). These conditions are ideal for them when breeding.

Swordtail Red Velvet

Best Freshwater Aquarium Fish Combination - For all your creative needs!

This species will add appeal and beauty to your aquarium, Swordtail red velvets are small fish and they don’t grow more than 5 inches in length.

Aquarium Habitat​

They prefer to swim in the top and middle columns of the aquarium; they, however, require sufficient space for swimming.

Their water should be a bit salty and oxygenated that is how they enjoy it. You can use a teaspoon to measure salt quantity to put in your aquarium. Two teaspoons full of salt in the 10-gallon aquarium is preferred.

The perfect tank make for the Swordtail velvets are the catfish, they don’t be aggressive and share the same care requirements with the Swordtail velvets.


These Swordtails are omnivorous, they feed on larvae plants and worms, they love live foods the flakes and fish pellets are best for them too.

You should try to feed this fish twice daily ranging from vegetables and proteins so they can have a balanced diet.

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Breeding Condition

They are live breeders and they reproduce already swimming babies, be sure not to turn them into meal for other fish, you should have a hiding place for them.

Betta Splendens Siamese

Best Freshwater Aquarium Fish Combination

These fish have adoring coloration and flowing fins, the male betas are more accepted them the female betas they females do not have such beautiful colors and their fins are not so long as the males.

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Aquarium Habitat​​

“You should not have the males living in the same aquarium”, but the females are very friendly with each other, you can put in one male amidst the females but not the fin-nipping species.

The can endure heat but a temperature of 75(degrees .F.) should be maintained. The betas can breathe on the water surface.

They are friendly and can live in a community aquarium with the absence of fin-nipping betas and similar species.


Betas take live food such as insects and larvae, they have a different body system from the other fish that take vegetables.

They digest protein faster and easier, but this does not mean they can’t adapt to eating the usual fish flakes and frozen-dried food, the best choices include; brine shrimp, plankton, and daphnia.

Breeding Condition

The betas have a short life span, because of this, they start to breed even before they are a year old. Feed them live foods before breeding and a temperature of 80 (degrees) should be maintained and a PH of 7.

When the males are ready to spawn, you should provide them with a hiding place and the females too because at this stage they tend to be aggressive. They prefer to spawn in a bubble nest, the males wrap around an upturned female and take the eggs been expelled for fertilization, it is the male duty to take care of the eggs until they hatch.

The males should be removed from the young before they eat them; the younglings should be feed brine shrimps.

Serbia Corydoras Cory Catfish

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These catfish are known to be the most peaceful bottom dwellers that make a good community fish. they have white spots on their dark bodies, they are tiny fish that does not grow beyond 3 inches, they have a life span of 3-4 years.

Aquarium Habitat​​

These species are quite different they prefer a dark and soft bottom tank at a temperature of 70-77(degrees F.). The environment should have adequate space and clear water for swimming with sufficient vegetation.


They are omnivorous bottom dwellers so they will feed on green live foods, frozen foods.

Breeding Condition

The male embeds to the female to fertilize their eggs, the females then pass the eggs through a particular pouch, they attach the eggs to surfaces.

The eggs take only 5 days to hatch; you can feed them with micro-plankton while they grow.

Blue German Ramirezi Cichlid

These are beautiful dwarf species, they have yellow and blue colorings that glitter in the light

Aquarium Habitat​​

The ideal environment is a water PH of 6, it should be soft and maintaining a temperature of 79-86(degrees .F.). The Cichlid are very sensitive to water so water must be quality. Ammonia and nitrates levels should be low

Butterfly Cichlids species do not require a large amount of space for swimming so 10 gallons.

Breeding Condition

There is no characteristic feature that distinguishes the females from the males so you need to introduce them while they are in a school then wait for paring to occur before you separate them.

They tend to breed on leaves and rocks, the rams lay as many as 400 eggs which hatch and become waterborne within 3-4 days, the parents take care of the eggs till they can fend for themselves.

Black Molly

Best Freshwater Aquarium Fish Combination

This is another freshwater fish that makes a great choice!

Their black color is a result of skin condition, mollies suffer from excess melanin (Amino Acid) as a result of pigment absence on the skin.

Black mollies have a tiny body size, they don’t exceed 3 inches but the females are slightly bigger, they can live up to 5 years depending on how you take of them.

Aquarium Habitat​​

Mollies are a very peaceful community fish, you should be careful not to put too many males as they can become very aggressive so ensure safety you should introduce a ratio of one male to three females

As swimming and water lovers, they require a large tank at about a 20-gallon aquarium., they can survive in any water but freshwater is most suitable for them, the temperature should be around 80(degrees) and a PH of about 7.6 -8.3.


Black mollies don’t stress at all they can eat almost anything, they feed on algae they will help control an algae breakout in the aquarium. They are omnivorous fish and can also feed on plant materials and bloodworms.

Breeding Condition

Male mollies are very aggressive; you should expect fry in a few weeks if the conditions are fair for them to reproduce. Bigger mollies are not a good idea they will end up eating anyone they can find.


Keeping a freshwater aquarium is not quite difficult you only have to be aware of the perfect conditions. So choose a freshwater combination that will be most suitable for you.