Corydoras Catfish Tank Mates

• Agassiz's Corydoras✅ Compatible
  Peaceful · 6 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 bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Agassiz's Corydoras 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; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Betta✅ Compatible
  Semi-aggressive · 6.5 cm · Easy care · 24–28 °C (75–82 °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 Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Black Skirt Tetra✅ Compatible
  Semi-aggressive · 6 cm · Easy care · 20–26 °C (68–79 °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 Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Black Skirt Tetra in a shoal of 6+ or it gets stressed and nippy.
• Blackline Rasbora✅ Compatible
  Peaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
  • Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Blackline Rasbora in a shoal of 6+ or it gets stressed and nippy.
• Blood Red Tiger Pleco✅ Compatible
  Peaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Butterfly Hillstream Loach✅ Compatible
  Peaceful · 6 cm · Hard care · 18–24 °C (64–75 °F)
  • Compatible on the things that matter: shared water near 22–24 °C, workable temperaments, and no predator-and-prey size gap.
  • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish 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)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Corydoras Catfish 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.
• Costa's Tetra✅ Compatible
  Peaceful · 7 cm · Easy care · 22–28 °C (72–82 °F)
  • Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
  • Keep Corydoras Catfish 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)
  • Compatible on the things that matter: shared water near 24–26 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Desert Goby✅ Compatible
  Semi-aggressive · 6 cm · Easy care · 18–28 °C (64–82 °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 bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Diamond Tetra✅ Compatible
  Peaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
  • Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Diamond Tetra in a shoal of 6+ or it gets stressed and nippy.
• Eastern Betta✅ Compatible
  Semi-aggressive · 6 cm · Medium care · 24–28 °C (75–82 °F)
  • Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–26 °C — no size, zone or temperament conflicts.
  • Keep Corydoras Catfish 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.
  • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Mahachai Betta✅ Compatible
  Aggressive · 7 cm · Medium care · 24–30 °C (75–86 °F)
  • Peaceful + 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 Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Peacock Gudgeon✅ Compatible
  Peaceful · 7 cm · Medium 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.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Peppered Corydoras✅ Compatible
  Peaceful · 7 cm · Easy care · 18–26 °C (64–79 °F)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Peppered Corydoras in a shoal of 6+ or it gets stressed and nippy.
• Rio Negro Checkerboard Cichlid✅ Compatible
  Peaceful · 7 cm · Hard care · 24–29 °C (75–84 °F)
  • Both are peaceful, and their water overlaps around 24–26 °C — no size, zone or temperament conflicts.
  • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Roundtail Paradise Fish✅ Compatible
  Semi-aggressive · 7 cm · Easy care · 10–26 °C (50–79 °F)
  • Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Spotfin Corydoras✅ Compatible
  Peaceful · 6.5 cm · Easy care · 22–26 °C (72–79 °F)
  • Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
  • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Spotfin Corydoras in a shoal of 6+ or it gets stressed and nippy.
• Spotted Corydoras✅ Compatible
  Peaceful · 7 cm · Easy care · 22–27 °C (72–81 °F)
  • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Spotted Corydoras in a shoal of 6+ or it gets stressed and nippy.
• Sterbai Corydoras✅ Compatible
  Peaceful · 6.5 cm · Medium care · 24–30 °C (75–86 °F)
  • Compatible on the things that matter: shared water near 24–26 °C, workable temperaments, and no predator-and-prey size gap.
  • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Sterbai Corydoras in a shoal of 6+ or it gets stressed and nippy.
• Sumo Loach✅ Compatible
  Semi-aggressive · 7 cm · Medium care · 22–26 °C (72–79 °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 bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Umbrella Dwarf Cichlid✅ Compatible
  Semi-aggressive · 7 cm · Medium care · 20–26 °C (68–79 °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.
  • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Corydoras Catfish 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)
  • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Amazon Puffer⚠️ With caution
  Peaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
  • Your 75 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish 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⚠️ With caution
  Semi-aggressive · 7 cm · Hard care · 24–29 °C (75–84 °F)
  • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
• Black Ruby Barb⚠️ With caution
  Semi-aggressive · 6 cm · Easy care · 22–26 °C (72–79 °F)
  • Your 75 L tank is below the ~100 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Black Ruby Barb in a shoal of 6+ or it gets stressed and nippy.
• Bleeding Heart Tetra⚠️ With caution
  Semi-aggressive · 7 cm · Medium care · 23–28 °C (73–82 °F)
  • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish 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.
• Bright Diamond Tetra⚠️ With caution
  Peaceful · 7 cm · Hard care · 24–28 °C (75–82 °F)
  • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish 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.
• Buenos Aires Tetra⚠️ With caution
  Semi-aggressive · 7 cm · Easy care · 18–26 °C (64–79 °F)
  • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish 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.
• Colombian Tetra⚠️ With caution
  Semi-aggressive · 6.5 cm · Easy care · 24–28 °C (75–82 °F)
  • Your 75 L tank is below the ~114 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
• Congo Tetra⚠️ With caution
  Peaceful · 8 cm · Medium care · 22–28 °C (72–82 °F)
  • Your 75 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
• Dwarf Chain Loach⚠️ With caution
  Peaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
  • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Dwarf Chain Loach in a shoal of 6+ or it gets stressed and nippy.
• Glass Catfish⚠️ With caution
  Peaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
  • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish 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.
• Melon Barb⚠️ With caution
  Peaceful · 7 cm · Easy care · 22–28 °C (72–82 °F)
  • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Melon Barb in a shoal of 8+ or it gets stressed and nippy.
• Pantanal Corydoras⚠️ With caution
  Peaceful · 8 cm · Medium care · 22–27 °C (72–81 °F)
  • Your 75 L tank is below the ~110 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish 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.
• Rounded Filament Barb⚠️ With caution
  Peaceful · 7 cm · Medium care · 22–27 °C (72–81 °F)
  • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Rounded Filament Barb in a shoal of 6+ or it gets stressed and nippy.
• Scissortail Rasbora⚠️ With caution
  Peaceful · 8 cm · Easy care · 22–27 °C (72–81 °F)
  • Your 75 L tank is below the ~90 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish 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.
• Tiger Barb⚠️ With caution
  Semi-aggressive · 7 cm · Easy care · 22–28 °C (72–82 °F)
  • Your 75 L tank is below the ~95 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Tiger Barb in a shoal of 6+ or it gets stressed and nippy.
• Discus⛔ Not recommended
  Peaceful · 20 cm · Hard care · 28–31 °C (82–88 °F)
  • Temperature needs don't overlap (Corydoras Catfish 22–26 °C vs Discus 28–31 °C).
  • Your 75 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
  • Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Keep Discus in a shoal of 6+ or it gets stressed and nippy.
• German Blue Ram⛔ Not recommended
  Peaceful · 6 cm · Hard care · 27–30 °C (81–86 °F)
  • Temperature needs don't overlap (Corydoras Catfish 22–26 °C vs German Blue Ram 27–30 °C).
  • Keep Corydoras Catfish 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.