Congo Tetra Tank Mates

• Amazon Puffer✅ Compatible
  Peaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Amazon Puffer in a shoal of 6+ or it gets stressed and nippy.
• Ash Lipped Apisto✅ Compatible
  Semi-aggressive · 7 cm · Hard care · 24–29 °C (75–84 °F)
  • Peaceful + Semi-aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Banded Dwarf Cichlid✅ Compatible
  Semi-aggressive · 7 cm · Medium care · 24–30 °C (75–86 °F)
  • Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Black Kuhli Loach✅ Compatible
  Peaceful · 8 cm · Easy care · 23–28 °C (73–82 °F)
  • Both are peaceful, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Bleeding Heart Tetra✅ Compatible
  Semi-aggressive · 7 cm · Medium care · 23–28 °C (73–82 °F)
  • Compatible on the things that matter: shared water near 23–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Bleeding Heart Tetra in a shoal of 6+ or it gets stressed and nippy.
• Bolivian Ram✅ Compatible
  Peaceful · 8 cm · Medium care · 24–28 °C (75–82 °F)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Bright Diamond Tetra✅ Compatible
  Peaceful · 7 cm · Hard care · 24–28 °C (75–82 °F)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Bright Diamond Tetra in a shoal of 8+ or it gets stressed and nippy.
• Brilliant Rasbora✅ Compatible
  Peaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
  • Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Brilliant Rasbora in a shoal of 6+ or it gets stressed and nippy.
• Buenos Aires Tetra✅ Compatible
  Semi-aggressive · 7 cm · Easy care · 18–26 °C (64–79 °F)
  • Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Buenos Aires Tetra in a shoal of 6+ or it gets stressed and nippy.
• Burmese Loach✅ Compatible
  Peaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
  • Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Celebes Rainbowfish✅ Compatible
  Peaceful · 7 cm · Medium care · 22–28 °C (72–82 °F)
  • Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Celebes Rainbowfish in a shoal of 6+ or it gets stressed and nippy.
• Clown Pleco✅ Compatible
  Peaceful · 9 cm · Medium care · 24–28 °C (75–82 °F)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Costa's Tetra✅ Compatible
  Peaceful · 7 cm · Easy care · 22–28 °C (72–82 °F)
  • Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Costa's Tetra in a shoal of 6+ or it gets stressed and nippy.
• Croaking Gourami✅ Compatible
  Peaceful · 7 cm · Easy care · 24–28 °C (75–82 °F)
  • Both are peaceful, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Glass Catfish✅ Compatible
  Peaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Glass Catfish in a shoal of 6+ or it gets stressed and nippy.
• Gold Barb✅ Compatible
  Peaceful · 7.5 cm · Easy care · 18–26 °C (64–79 °F)
  • Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Gold Barb in a shoal of 6+ or it gets stressed and nippy.
• Hongsloi Dwarf Cichlid✅ Compatible
  Semi-aggressive · 7 cm · Medium care · 24–29 °C (75–84 °F)
  • Peaceful + Semi-aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Leopard Frog Pleco✅ Compatible
  Peaceful · 9 cm · Medium care · 25–30 °C (77–86 °F)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Pantanal Corydoras✅ Compatible
  Peaceful · 8 cm · Medium care · 22–27 °C (72–81 °F)
  • Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Pantanal Corydoras in a shoal of 6+ or it gets stressed and nippy.
• Scissortail Rasbora✅ Compatible
  Peaceful · 8 cm · Easy care · 22–27 °C (72–81 °F)
  • Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Scissortail Rasbora in a shoal of 6+ or it gets stressed and nippy.
• Silver Tetra✅ Compatible
  Peaceful · 9 cm · Easy care · 24–28 °C (75–82 °F)
  • Both are peaceful, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Silver Tetra in a shoal of 6+ or it gets stressed and nippy.
• Splashing Tetra✅ Compatible
  Peaceful · 8 cm · Medium care · 22–28 °C (72–82 °F)
  • Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
• Thick-lipped Gourami✅ Compatible
  Peaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Zebra Loach✅ Compatible
  Peaceful · 9 cm · Medium care · 23–26 °C (73–79 °F)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Afra Cichlid⚠️ With caution
  Semi-aggressive · 10 cm · Medium care · 24–28 °C (75–82 °F)
  • Different pH ranges (6–7.5 vs 7.8–8.6); doable if you sit in the shared band, but not ideal long-term.
  • Afra Cichlid is semi-aggressive and may chase or nip the smaller Congo Tetra — plant heavily and break up sight lines.
  • Your 120 L tank is below the ~150 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Afra Cichlid in a shoal of 6+ or it gets stressed and nippy.
• African Butterfly Cichlid⚠️ With caution
  Semi-aggressive · 8 cm · Medium care · 22–28 °C (72–82 °F)
  • Expect African Butterfly Cichlid to harass Congo Tetra at times; give dense cover and watch them at feeding.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Agassiz's Dwarf Cichlid⚠️ With caution
  Semi-aggressive · 9 cm · Medium care · 24–30 °C (75–86 °F)
  • Agassiz's Dwarf Cichlid and Congo Tetra are close in size, but the semi-aggressive one tends to dominate — add congo tetra in a group to spread the pressure.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Badis⚠️ With caution
  Semi-aggressive · 8 cm · Medium care · 22–28 °C (72–82 °F)
  • Badis and Congo Tetra are close in size, but the semi-aggressive one tends to dominate — add congo tetra in a group to spread the pressure.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Bamboo Shrimp⚠️ With caution
  Peaceful · 8 cm · Medium care · 22–27 °C (72–81 °F)
  • Congo Tetra may eat Bamboo Shrimp or pick off its shrimplets — a densely planted tank with moss gives them a fighting chance.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Bandit Cichlid⚠️ With caution
  Semi-aggressive · 9 cm · Medium care · 22–26 °C (72–79 °F)
  • Bandit Cichlid is semi-aggressive and may chase or nip the smaller Congo Tetra — plant heavily and break up sight lines.
  • Your 120 L tank is below the ~150 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Bandit Cichlid in a shoal of 6+ or it gets stressed and nippy.
• Brichardi Cichlid⚠️ With caution
  Semi-aggressive · 9 cm · Medium care · 24–28 °C (75–82 °F)
  • Different pH ranges (6–7.5 vs 7.8–9); doable if you sit in the shared band, but not ideal long-term.
  • Expect Brichardi Cichlid to harass Congo Tetra at times; give dense cover and watch them at feeding.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Cockatoo Dwarf Cichlid⚠️ With caution
  Semi-aggressive · 8 cm · Medium care · 24–28 °C (75–82 °F)
  • Expect Cockatoo Dwarf Cichlid to harass Congo Tetra at times; give dense cover and watch them at feeding.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Convict Cichlid⚠️ With caution
  Aggressive · 10 cm · Easy care · 21–28 °C (70–82 °F)
  • Expect Convict Cichlid to harass Congo Tetra at times; give dense cover and watch them at feeding.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Daffodil Cichlid⚠️ With caution
  Semi-aggressive · 10 cm · Medium care · 23–27 °C (73–81 °F)
  • pH preferences only just meet (Congo Tetra 6–7.5 vs Daffodil Cichlid 7.8–9) — target the overlap and acclimate slowly.
  • Daffodil Cichlid is semi-aggressive and may chase or nip the smaller Congo Tetra — plant heavily and break up sight lines.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Demasoni Cichlid⚠️ With caution
  Aggressive · 9 cm · Hard care · 23–27 °C (73–81 °F)
  • Different pH ranges (6–7.5 vs 7.8–8.6); doable if you sit in the shared band, but not ideal long-term.
  • Demasoni Cichlid is aggressive and may chase or nip the smaller Congo Tetra — plant heavily and break up sight lines.
  • Your 120 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Demasoni Cichlid in a shoal of 12+ or it gets stressed and nippy.
• Dwarf Gourami⚠️ With caution
  Semi-aggressive · 8 cm · Medium care · 24–28 °C (75–82 °F)
  • Dwarf Gourami and Congo Tetra are close in size, but the semi-aggressive one tends to dominate — add congo tetra in a group to spread the pressure.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Electric Yellow Cichlid⚠️ With caution
  Semi-aggressive · 10 cm · Medium care · 23–26 °C (73–79 °F)
  • Different pH ranges (6–7.5 vs 7.8–8.9); doable if you sit in the shared band, but not ideal long-term.
  • Electric Yellow Cichlid and Congo Tetra are close in size, but the semi-aggressive one tends to dominate — add congo tetra in a group to spread the pressure.
  • Your 120 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Goldeneye Dwarf Cichlid⚠️ With caution
  Semi-aggressive · 8 cm · Easy care · 24–28 °C (75–82 °F)
  • Expect Goldeneye Dwarf Cichlid to harass Congo Tetra at times; give dense cover and watch them at feeding.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Lifalili Jewel Cichlid⚠️ With caution
  Aggressive · 9 cm · Medium care · 22–28 °C (72–82 °F)
  • Expect Lifalili Jewel Cichlid to harass Congo Tetra at times; give dense cover and watch them at feeding.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Mexican Tetra⚠️ With caution
  Semi-aggressive · 9 cm · Easy care · 18–25 °C (64–77 °F)
  • Mexican Tetra is semi-aggressive and may chase or nip the smaller Congo Tetra — plant heavily and break up sight lines.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
• Alligator Gar⛔ Not recommended
  Aggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
  • Congo Tetra is bite-sized to a 250 cm predatory alligator gar — it will be eaten.
  • Alligator Gar is aggressive and may chase or nip the smaller Congo Tetra — plant heavily and break up sight lines.
  • Your 120 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Clown Knifefish⛔ Not recommended
  Aggressive · 90 cm · Hard care · 24–28 °C (75–82 °F)
  • Clown Knifefish (90 cm) is big enough to swallow the 8 cm Congo Tetra whole.
  • Expect Clown Knifefish to harass Congo Tetra at times; give dense cover and watch them at feeding.
  • Your 120 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Fire Eel⛔ Not recommended
  Semi-aggressive · 100 cm · Medium care · 24–28 °C (75–82 °F)
  • Fire Eel (100 cm) is big enough to swallow the 8 cm Congo Tetra whole.
  • Expect Fire Eel to harass Congo Tetra at times; give dense cover and watch them at feeding.
  • Your 120 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Koi⛔ Not recommended
  Peaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
  • Size gap is too large (90 vs 8 cm): Koi will treat Congo Tetra as food.
  • Your 120 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Redtail Catfish⛔ Not recommended
  Aggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
  • Redtail Catfish (120 cm) is big enough to swallow the 8 cm Congo Tetra whole.
  • Redtail Catfish is aggressive and may chase or nip the smaller Congo Tetra — plant heavily and break up sight lines.
  • Your 120 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Spotted Gar⛔ Not recommended
  Aggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
  • Congo Tetra is bite-sized to a 90 cm predatory spotted gar — it will be eaten.
  • Expect Spotted Gar to harass Congo Tetra at times; give dense cover and watch them at feeding.
  • Your 120 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Wels Catfish⛔ Not recommended
  Aggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
  • Congo Tetra is bite-sized to a 300 cm predatory wels catfish — it will be eaten.
  • Expect Wels Catfish to harass Congo Tetra at times; give dense cover and watch them at feeding.
  • Your 120 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Wolf Cichlid⛔ Not recommended
  Aggressive · 72 cm · Hard care · 24–30 °C (75–86 °F)
  • Wolf Cichlid (72 cm) is big enough to swallow the 8 cm Congo Tetra whole.
  • Expect Wolf Cichlid to harass Congo Tetra at times; give dense cover and watch them at feeding.
  • Your 120 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.

Compatibility is computed from each species' care data — a strong starting point, not a guarantee. Individual temperament varies, so always introduce new fish slowly and watch them.