Top 8 Most Suitable Blue Gularis Killifish Tank Mates

The Blue Gularis Killifish are the largest killifish species, whose size can reach 5.1 inches (13 cm) when fully mature. With a semi-aggressive temperament, blue gularis killifish can get along well with the peaceful fish varieties. However, with the big size, they can stress out the other small fish and even consider these tiny fish species as food sources.

In this article, you will find out which are the appropriate blue gularis killifish tank mates for your community aquarium.

Top 8 Best Blue Gularis Killifish Tank Mates

The blue gularis killes can be kept in a community tank with settings similar to their natural habitat. The ideal blue gularis killifish tank mates are those with peaceful to semi-aggressive temperaments – similar to theirs and having a large size that cannot be considered foods. 

The large species from the Cichlids (such as Severum and Angelfish) and Characins (such as Discus Tetra and Glass Bloodfin Tetra) can be good choices for adding into a large community tank with larger killifish like the blue gularis.

Here are some species to accompany the blue gularis killes that you can consider:

Severum Cichlid

  • Scientific Name: Heros severus
  • Origin: South America
  • Water temperature: 26 – 27°C (79 – 81°F)
  • Water pH: 6.0 – 6.5
  • Size: 8 inches
  • Temperament: semi-aggressive
  • Lifespan: up to 10 years
Gold Severum Cichlids
Gold Severum Cichlids (Heros severus)

Severum Cichlids is a low-maintenance freshwater species and belongs to the Cichlids family. Their other common names are Severums, Banded Cichlids, and Poor Man’s Discus.

The Severum is generally peaceful and has a size of around 8 inches, making them suitable for being one of the ideal blue gularis killifish tank mates.

However, during the Severum’s spawning period, their temperament can become more aggressive and territorial.


  • Scientific Name: Pterophyllum
  • Origin: South America
  • Water temperature: around 27°C (80°F)
  • Water pH: 6.8 – 7.0
  • Size: ~6 inches
  • Temperament: semi-aggressive 
  • Lifespan: more than 10 years
Angelfish (Pterophyllum)

Angelfish is another species of the Cichlids family. They are hardy fish and have an omnivorous diet. They prefer inhabiting freshwater environments with a slow current.

They are active, showy fish that swim in the mid-levels of the tank. The Angelfish is more active in the daytime than in the nighttime.

Just like many of the cichlids, they act relatively peaceful toward other fishes but become aggressive in the spawning season.

Discus Tetra

  • Scientific Name: Brachychalcinus orbicularis
  • Origin: tropical South America
  • Water temperature: 18 – 24°C (64.4 – 75.2°F)
  • Water pH: 5.0 – 7.5
  • Size: ~3.5 inches (~9cm)
  • Temperament: Peaceful 
  • Lifespan: 5 years
Discus tetra (Brachychalcinus orbicularis)
Discus tetra (Brachychalcinus orbicularis)

This peaceful Discus Tetra belongs to the Characins family and naturally inhabits lowland rivers, creeks, and tributaries.

They have a peaceful temperament but can give a threatening sense to the tiny and the much more quiet fish owing to their relatively big size. Therefore, they can be suitable for companying quite larger or similar-size species. Yes, they can be a good tank mate for your blue gularis killifish.

Note that you should keep the Discus Tetra in decent numbers to avoid them getting aggressive since they may have fiery behaviors to maintain their hierarchical position within their group.

Glass Bloodfin Tetra

  • Scientific Name: Prionobrama filigera
  • Origin: South America
  • Water temperature: 23 – 27°C (73 – 80°F)
  • Water pH: 6.0 – 7.5
  • Size: 2.4 inches (~6cm) (average)
  • Temperament: Peaceful 
  • Lifespan: 5 – 8 years
Glass Bloodfin Tetra (Prionobrama filigera)
Glass Bloodfin Tetra (Prionobrama filigera)

Included in the Characins family, the Glass Bloodfin Tetra is generally peaceful and suitably in a community tank with species sharing similar water conditions.

Armored Catfish

  • Scientific Name: Loricariids
  • Origin: tropical South America and Central America
  • Water temperature: 23 – 27°C (74 – 80°F)
  • Water pH: 7.0 – 8.0
  • Size: Variable, from 3 inches to 24 inches (~7.62 cm – 53 cm)
  • Temperament: Peaceful
  • Lifespan: 10-15 years
Armored catfish (Loricariid pleco)
Armored catfish (Loricariid pleco)

The armored catfish (Loricariids) are suckermouth catfish that have cleaning behavior. They have peaceful behavior and can be sociable, making them easily and quickly adapt to the aquarium community life. 

They are nocturnal and, therefore, they will easily avoid bright lighting.

Black Ghost Knifefish

  • Scientific Name: Apteronotus albifrons
  • Origin: South America
  • Water temperature: 23 – 27°C (74 – 80°F)
  • Water pH: 6.5 – 8.0
  • Size: 20 inches (~51 cm)
  • Temperament: Semi-aggressive/ Shy, sometimes territorial
  • Lifespan: 10-15 years
Black Ghost Knifefish (Apteronotus albifrons)
Black Ghost Knifefish (Apteronotus albifrons)

Bottom dwellers are ideal for becoming blue gularis killifish tank mates, and the Black Ghost Knifefish can be one of the best candidates. 

With a shy and quiet temperament, this bottom-dwelling species can go well with many fish varieties.

The Ghost Knifefish are weakly electric species, so in the aquarium, they may need a tubular, enclosed space to protect themselves from the electrical impulses of their tank mates.


  • Scientific Name: Puntigrus tetrazona, Pethia nigrofasciata, Pethia conchonius
  • Origin: Asia
  • Water temperature: 23 – 27°C (74 – 80°F)
  • Water pH: 6.5 – 8.0
  • Size: 1 – 16 inches (2.5 – 40 cm)
  • Temperament: Peaceful, Semi-Aggressive
  • Lifespan: 10-15 years
Rosy barb (Pethia conchonius)
Rosy barb (Pethia conchonius)

This species can be a bit aggressive towards slow or long-finned tank mates like Bettas, yet can get along splendidly with the large Killifish like the blue gularis, who also have a semi-aggressive temperament.

Twig Catfish

  • Scientific Name: Farlowella
  • Origin: South America
  • Water temperature: 23 – 26°C (75 – 79°F)
  • Water pH: 6.0 – 7.0
  • Size: up to 9 inches (22.86 cm)
  • Temperament: Peaceful
  • Lifespan: 5-15 years
Twig catfish (Farlowella)
Twig catfish (Farlowella)

Being members of the Loricariidae fish family, the Twig Catfish are somehow similar to their relatives in terms of being vegetarians and usually feeding on soft algae and biofilms accumulated in the aquarium environment.

You should keep them well fed by providing blanched vegetables and sinking Spirulina wafers.

What Make A Good Tankmate For Blue Gularis Killifish?

Have larger or the same size

Blue Gularis the largest killifish species with a size that can be up to 5 inches. Their big size can cause stress to the smaller fish. Thus, it is critical to choose fish species having larger or the same size as them. In this way, a blue gularis cannot threaten those mates or consider them as its food. 

Live in the same water environments

When keeping various fish species together, considering whether they share the same water environment is important because this will critically help your fish community to live in harmony and be healthy. Thus, you should keep this in mind when choosing the tank mates for your blue gularis killies.

The blue gularis is a freshwater fish species. In captivity, they can live well in the tank setting similar to their natural habitat.

The blue gularis killifish do best in the water environments with temperatures of 20 – 26ºC (73ºF – 79ºF) and pH levels of 6.0 – 8.0. Additionally, the aquarium surrounding should include a peat moss substrate and a lot of plants to mimic their natural living environment.

Have a similar temperament

Selecting the fish species with a similar temperament can help prevent them from getting aggressive and attacking the others. Since the blue gularis have a semi-aggressive temperament, their most suitable tank mates are those with peaceful to semi-aggressive temperaments.

Video: Blue Gularis Killifish In Aquarium Community


Can killifish be kept with angelfish?

The large killifish like the blue gularis con be kept in the community tank with angelfish.

Can you put killifish with betta?

Probably not because Betta is a highly territorial fish, which can make your killifish get aggressive and stressed when being in the same aquarium. Moreover, the bettas consider killifish eggs and fry their good snacks.

Are blue gularis killifish aggressive?

They are generally peaceful, but the males can get aggressive towards each other in the small tank with another male. If you want to have more than one male blue gularis, consider using a large-size tank (~ 20-gallon tank) since they can have more spaces to hide and avoid other nippy mates.


The most appropriate blue gularis killifish tank mates are those having a size as big as or relatively larger than the size of your blue gularis. The temperament is also important as the blue gularis will not get along with the aggressive species. Peaceful or semi-aggressive mates are ideal as they will not get too fiery to attack others. Moreover, considering the water conditions before selecting blue gularis killifish tank mates also plays a crucial role in building a healthy community tank.

8 fish species listed in this article, including Severum, Angelfish, Discus Tetra, Glass Bloodfin Tetra, Armored Catfish, Black Ghost Knifefish, Barbs, and Twig Catfish, are the varieties that share the same water condition as that of the blue gularis. Plus, their size and temperament meet the mentioned requirements. Thus, you can consider getting these fishes when thinking of the blue gularis killifish tank mates

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