Colombian Tetra Tank Mates

• Adolf's Cory✅ Compatible
  Peaceful · 5.5 cm · Medium care · 22–26 °C (72–79 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–26 °C — no size, zone or temperament conflicts.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Adolf's Cory in a shoal of 6+ or it gets stressed and nippy.
• Agassiz's Corydoras✅ Compatible
  Peaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Colombian Tetra 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.
• Blood Red Tiger Pleco✅ Compatible
  Peaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
  • Keep Colombian 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)
  • Semi-aggressive + Peaceful, 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 middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Colombian 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.
• Butterfly Hillstream Loach✅ Compatible
  Peaceful · 6 cm · Hard care · 18–24 °C (64–75 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–24 °C — no size, zone or temperament conflicts.
  • Keep Colombian 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)
  • Semi-aggressive + Peaceful, but with no direct clash here, 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 Colombian 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.
• Corydoras Catfish✅ Compatible
  Peaceful · 6.5 cm · Easy care · 22–26 °C (72–79 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Corydoras Catfish 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)
  • Compatible on the things that matter: shared water near 24–28 °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 Colombian 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.
• Duplicareus Corydoras✅ Compatible
  Peaceful · 5.5 cm · Medium care · 23–27 °C (73–81 °F)
  • Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Duplicareus Corydoras in a shoal of 6+ or it gets stressed and nippy.
• Dwarf Chain Loach✅ Compatible
  Peaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
  • Keep Colombian Tetra 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.
• Elegant Cory✅ Compatible
  Peaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Elegant Cory in a shoal of 6+ or it gets stressed and nippy.
• False Julii Corydoras✅ Compatible
  Peaceful · 6 cm · Easy care · 22–26 °C (72–79 °F)
  • Compatible on the things that matter: shared water near 24–26 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep False Julii Corydoras in a shoal of 6+ or it gets stressed and nippy.
• German Blue Ram✅ Compatible
  Peaceful · 6 cm · Hard care · 27–30 °C (81–86 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Colombian Tetra 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)
  • Semi-aggressive + Peaceful, 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 middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Colombian 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.
• Hillstream Loach✅ Compatible
  Peaceful · 6 cm · Hard care · 20–24 °C (68–75 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
• Melon Barb✅ Compatible
  Peaceful · 7 cm · Easy care · 22–28 °C (72–82 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here, 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 Colombian Tetra 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.
• Peacock Gudgeon✅ Compatible
  Peaceful · 7 cm · Medium care · 22–28 °C (72–82 °F)
  • Compatible on the things that matter: shared water near 24–28 °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 Colombian Tetra 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)
  • Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Colombian Tetra 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)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
• Rounded Filament Barb✅ Compatible
  Peaceful · 7 cm · Medium care · 22–27 °C (72–81 °F)
  • Semi-aggressive + Peaceful, 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 middle of the tank — offer enough cover so they aren't always in each other's space.
  • Keep Colombian Tetra 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.
• Slate Corydoras✅ Compatible
  Peaceful · 6 cm · Medium care · 23–28 °C (73–82 °F)
  • Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Slate Corydoras 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)
  • Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Keep Colombian Tetra 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)
  • Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Colombian Tetra 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 24–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Colombian Tetra 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.
• Ash Lipped Apisto⚠️ With caution
  Semi-aggressive · 7 cm · Hard care · 24–29 °C (75–84 °F)
  • Colombian Tetra and Ash Lipped Apisto can both be territorial; doable with space and dense planting, but watch for chasing.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
• Banded Dwarf Cichlid⚠️ With caution
  Semi-aggressive · 7 cm · Medium care · 24–30 °C (75–86 °F)
  • Colombian Tetra and Banded Dwarf Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
• Betta⚠️ With caution
  Semi-aggressive · 6.5 cm · Easy care · 24–28 °C (75–82 °F)
  • Colombian Tetra and Betta can both be territorial; doable with space and dense planting, but watch for chasing.
  • Keep Colombian Tetra 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)
  • Colombian Tetra and Black Ruby Barb can both be territorial; doable with space and dense planting, but watch for chasing.
  • Keep Colombian Tetra 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.
• Black Skirt Tetra⚠️ With caution
  Semi-aggressive · 6 cm · Easy care · 20–26 °C (68–79 °F)
  • Colombian Tetra and Black Skirt Tetra can both be territorial; doable with space and dense planting, but watch for chasing.
  • Keep Colombian Tetra 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⚠️ With caution
  Peaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
  • Expect Colombian Tetra to harass Blackline Rasbora at times; give dense cover and watch them at feeding.
  • Keep Colombian Tetra 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.
• Bleeding Heart Tetra⚠️ With caution
  Semi-aggressive · 7 cm · Medium care · 23–28 °C (73–82 °F)
  • Colombian Tetra and Bleeding Heart Tetra can both be territorial; doable with space and dense planting, but watch for chasing.
  • Keep Colombian 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.
• Buenos Aires Tetra⚠️ With caution
  Semi-aggressive · 7 cm · Easy care · 18–26 °C (64–79 °F)
  • Colombian Tetra and Buenos Aires Tetra can both be territorial; doable with space and dense planting, but watch for chasing.
  • Keep Colombian 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.
• Croaking Gourami⚠️ With caution
  Peaceful · 7 cm · Easy care · 24–28 °C (75–82 °F)
  • Colombian Tetra is a notorious fin-nipper — even though Croaking Gourami is larger, an active shoal will harass its trailing fins. Only safe in a full group of 6+ with plenty of cover.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
• Desert Goby⚠️ With caution
  Semi-aggressive · 6 cm · Easy care · 18–28 °C (64–82 °F)
  • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
• Diamond Tetra⚠️ With caution
  Peaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
  • Colombian Tetra is semi-aggressive and may chase or nip the smaller Diamond Tetra — plant heavily and break up sight lines.
  • Keep Colombian Tetra 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.
• Hongsloi Dwarf Cichlid⚠️ With caution
  Semi-aggressive · 7 cm · Medium care · 24–29 °C (75–84 °F)
  • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
• Roundtail Paradise Fish⚠️ With caution
  Semi-aggressive · 7 cm · Easy care · 10–26 °C (50–79 °F)
  • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
  • Colombian Tetra is a notorious fin-nipper — even though Roundtail Paradise Fish is larger, an active shoal will harass its trailing fins. Only safe in a full group of 6+ with plenty of cover.
  • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
• Sumo Loach⚠️ With caution
  Semi-aggressive · 7 cm · Medium care · 22–26 °C (72–79 °F)
  • Colombian Tetra and Sumo Loach can both be territorial; doable with space and dense planting, but watch for chasing.
  • Keep Colombian Tetra 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)
  • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
  • Keep Colombian Tetra 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.
• Umbrella Dwarf Cichlid⚠️ With caution
  Semi-aggressive · 7 cm · Medium care · 20–26 °C (68–79 °F)
  • Colombian Tetra and Umbrella Dwarf Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
  • Keep Colombian 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)
  • Two assertive fish, one genuinely aggressive: Colombian Tetra and Alligator Gar will hold territory and clash.
  • Colombian Tetra is bite-sized to a 250 cm predatory alligator gar — it will be eaten.
  • Alligator Gar is slow and long-finned; a busy colombian tetra shoal tends to nip at it. Keep colombian tetra in a proper group of 6+ and watch them closely.
  • Your 114 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
  • Keep Colombian 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)
  • Colombian Tetra and Clown Knifefish are both territorial and at least one is outright aggressive — expect serious fighting.
  • Size gap is too large (90 vs 6.5 cm): Clown Knifefish will treat Colombian Tetra as food.
  • Your 114 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
  • Keep Colombian 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 6.5 cm Colombian Tetra whole.
  • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
  • Your 114 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
  • Keep Colombian 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)
  • Koi (90 cm) is big enough to swallow the 6.5 cm Colombian Tetra whole.
  • Colombian Tetra is a notorious fin-nipper — even though Koi is larger, an active shoal will harass its trailing fins. Only safe in a full group of 6+ with plenty of cover.
  • Your 114 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
  • Keep Colombian 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)
  • Two assertive fish, one genuinely aggressive: Colombian Tetra and Redtail Catfish will hold territory and clash.
  • Size gap is too large (120 vs 6.5 cm): Redtail Catfish will treat Colombian Tetra as food.
  • Your 114 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
  • Keep Colombian 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)
  • Two assertive fish, one genuinely aggressive: Colombian Tetra and Spotted Gar will hold territory and clash.
  • Spotted Gar (90 cm) is big enough to swallow the 6.5 cm Colombian Tetra whole.
  • Spotted Gar is slow and long-finned; a busy colombian tetra shoal tends to nip at it. Keep colombian tetra in a proper group of 6+ and watch them closely.
  • Your 114 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
  • Keep Colombian 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)
  • Two assertive fish, one genuinely aggressive: Colombian Tetra and Wels Catfish will hold territory and clash.
  • Wels Catfish (300 cm) is big enough to swallow the 6.5 cm Colombian Tetra whole.
  • Your 114 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
  • Keep Colombian 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)
  • Colombian Tetra and Wolf Cichlid are both territorial and at least one is outright aggressive — expect serious fighting.
  • Wolf Cichlid (72 cm) is big enough to swallow the 6.5 cm Colombian Tetra whole.
  • Colombian Tetra is a notorious fin-nipper — even though Wolf Cichlid is larger, an active shoal will harass its trailing fins. Only safe in a full group of 6+ with plenty of cover.
  • Your 114 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
  • Keep Colombian 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.