Mexican Tetra Tank Mates

• Agassiz's Corydoras✅ Compatible
  Peaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–25 °C — no size, zone or temperament conflicts.
  • Keep Mexican 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.
• Bearded Corydoras✅ Compatible
  Peaceful · 10 cm · Medium care · 18–24 °C (64–75 °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 Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Bearded Corydoras 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)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–25 °C — no size, zone or temperament conflicts.
  • Keep Mexican Tetra 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 24–25 °C — no size, zone or temperament conflicts.
  • Keep Mexican 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)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–25 °C — no size, zone or temperament conflicts.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
• Bristlenose Pleco✅ Compatible
  Peaceful · 12 cm · Easy care · 23–30 °C (73–86 °F)
  • Compatible on the things that matter: shared water near 23–25 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Mexican 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)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–25 °C — no size, zone or temperament conflicts.
  • Keep Mexican Tetra 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 18–24 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Mexican Tetra 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)
  • Compatible on the things that matter: shared water near 24–25 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Mexican Tetra 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)
  • Compatible on the things that matter: shared water near 22–25 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Mexican 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.
• 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 24–25 °C — no size, zone or temperament conflicts.
  • Keep Mexican 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)
  • Compatible on the things that matter: shared water near 22–25 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Mexican 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)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–25 °C — no size, zone or temperament conflicts.
  • Keep Mexican 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.
• Giant Kuhli Loach✅ Compatible
  Peaceful · 12 cm · Easy care · 24–30 °C (75–86 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–25 °C — no size, zone or temperament conflicts.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
• Kuhli Loach✅ Compatible
  Peaceful · 10 cm · Easy care · 24–30 °C (75–86 °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 Mexican 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)
  • 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 Mexican 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)
  • 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 Mexican 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.
• Peppered Corydoras✅ Compatible
  Peaceful · 7 cm · Easy care · 18–26 °C (64–79 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 18–25 °C — no size, zone or temperament conflicts.
  • Keep Mexican 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.
• Porthole Catfish✅ Compatible
  Peaceful · 10 cm · Easy care · 22–28 °C (72–82 °F)
  • Compatible on the things that matter: shared water near 22–25 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Mexican Tetra 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 Mexican 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 22–25 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Mexican 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.
• Spotted Rubbernose Pleco✅ Compatible
  Peaceful · 12 cm · Medium care · 20–26 °C (68–79 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 20–25 °C — no size, zone or temperament conflicts.
  • Keep Mexican Tetra 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 24–25 °C, workable temperaments, and no predator-and-prey size gap.
  • Keep Mexican 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.
• Striped Eel Loach✅ Compatible
  Peaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
  • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–25 °C — no size, zone or temperament conflicts.
  • Keep Mexican 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)
  • Mexican Tetra and Afra Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
  • Your 110 L tank is below the ~150 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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.
• Agassiz's Dwarf Cichlid⚠️ With caution
  Semi-aggressive · 9 cm · Medium care · 24–30 °C (75–86 °F)
  • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
  • Keep Mexican 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)
  • Mexican Tetra and Bandit Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
  • Your 110 L tank is below the ~150 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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)
  • Mexican Tetra and Brichardi Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
  • Your 110 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
• Brilliant Rasbora⚠️ With caution
  Peaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
  • Expect Mexican Tetra to harass Brilliant Rasbora at times; give dense cover and watch them at feeding.
  • Keep Mexican 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.
• Clown Rasbora⚠️ With caution
  Peaceful · 10 cm · Medium care · 23–28 °C (73–82 °F)
  • Mexican Tetra is a notorious fin-nipper — even though Clown Rasbora is larger, an active shoal will harass its trailing fins. Only safe in a full group of 6+ with plenty of cover.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Clown Rasbora 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)
  • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
  • Your 110 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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)
  • Mexican Tetra and Electric Yellow Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
  • Your 110 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
• Giant Danio⚠️ With caution
  Peaceful · 10 cm · Easy care · 20–27 °C (68–81 °F)
  • Giant Danio is slow and long-finned; a busy mexican tetra shoal tends to nip at it. Keep mexican tetra in a proper group of 6+ and watch them closely.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Keep Giant Danio in a shoal of 6+ or it gets stressed and nippy.
• Golden Wonder Killifish⚠️ With caution
  Semi-aggressive · 10 cm · Easy care · 22–28 °C (72–82 °F)
  • Mexican Tetra and Golden Wonder Killifish can both be territorial; doable with space and dense planting, but watch for chasing.
  • Golden Wonder Killifish is slow and long-finned; a busy mexican tetra shoal tends to nip at it. Keep mexican tetra in a proper group of 6+ and watch them closely.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
• Keyhole Cichlid⚠️ With caution
  Peaceful · 10 cm · Easy care · 22–28 °C (72–82 °F)
  • Mexican Tetra is a notorious fin-nipper — even though Keyhole Cichlid is larger, an active shoal will harass its trailing fins. Only safe in a full group of 6+ with plenty of cover.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
• Kribensis⚠️ With caution
  Semi-aggressive · 10 cm · Easy care · 24–27 °C (75–81 °F)
  • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
• Molly⚠️ With caution
  Peaceful · 10 cm · Easy care · 23–28 °C (73–82 °F)
  • Molly is slow and long-finned; a busy mexican tetra shoal tends to nip at it. Keep mexican tetra in a proper group of 6+ and watch them closely.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
• Silver Tetra⚠️ With caution
  Peaceful · 9 cm · Easy care · 24–28 °C (75–82 °F)
  • Mexican Tetra and Silver Tetra are close in size, but the semi-aggressive one tends to dominate — add silver tetra in a group to spread the pressure.
  • Your 110 L tank is below the ~115 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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.
• Thick-lipped Gourami⚠️ With caution
  Peaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
  • Expect Mexican Tetra to harass Thick-lipped Gourami at times; give dense cover and watch them at feeding.
  • Keep Mexican Tetra in a shoal of 6+ or it gets stressed and nippy.
• Zebra Loach⚠️ With caution
  Peaceful · 9 cm · Medium care · 23–26 °C (73–79 °F)
  • Your 110 L tank is below the ~115 L this pairing really wants — crowding raises aggression.
  • 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)
  • Mexican Tetra and Alligator Gar are both territorial and at least one is outright aggressive — expect serious fighting.
  • Alligator Gar (250 cm) is big enough to swallow the 9 cm Mexican Tetra whole.
  • Mexican Tetra is a notorious fin-nipper — even though Alligator Gar is larger, an active shoal will harass its trailing fins. Only safe in a full group of 6+ with plenty of cover.
  • Your 110 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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)
  • Two assertive fish, one genuinely aggressive: Mexican Tetra and Clown Knifefish will hold territory and clash.
  • Size gap is too large (90 vs 9 cm): Clown Knifefish will treat Mexican Tetra as food.
  • Your 110 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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)
  • Size gap is too large (100 vs 9 cm): Fire Eel will treat Mexican Tetra as food.
  • Mexican Tetra and Fire Eel can both be territorial; doable with space and dense planting, but watch for chasing.
  • Your 110 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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 9 cm Mexican Tetra whole.
  • Koi is slow and long-finned; a busy mexican tetra shoal tends to nip at it. Keep mexican tetra in a proper group of 6+ and watch them closely.
  • Your 110 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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)
  • Mexican Tetra and Redtail Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
  • Redtail Catfish (120 cm) is big enough to swallow the 9 cm Mexican Tetra whole.
  • Your 110 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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)
  • Mexican Tetra and Spotted Gar are both territorial and at least one is outright aggressive — expect serious fighting.
  • Spotted Gar (90 cm) is big enough to swallow the 9 cm Mexican Tetra whole.
  • Mexican Tetra is a notorious fin-nipper — even though Spotted Gar is larger, an active shoal will harass its trailing fins. Only safe in a full group of 6+ with plenty of cover.
  • Your 110 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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)
  • Mexican Tetra and Wels Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
  • Size gap is too large (300 vs 9 cm): Wels Catfish will treat Mexican Tetra as food.
  • Your 110 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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)
  • Two assertive fish, one genuinely aggressive: Mexican Tetra and Wolf Cichlid will hold territory and clash.
  • Mexican Tetra is bite-sized to a 72 cm predatory wolf cichlid — it will be eaten.
  • Wolf Cichlid is slow and long-finned; a busy mexican tetra shoal tends to nip at it. Keep mexican tetra in a proper group of 6+ and watch them closely.
  • Your 110 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
  • Keep Mexican 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.