Bucktooth Tetra Tank Mates

Bucktooth Tetra is aggressive, so its tank mates need choosing with care. Here are the 46 freshwater species that pair well with a bucktooth tetra — plus the 219 to avoid — with a live checker you can tune to your own tank.

By The Aquarium DB Team • Updated June 8, 2026 • Full Bucktooth Tetra care guide →
Best matches

The best tank mates for a bucktooth tetra

  • Axelrod's Cory ✅ Compatible
    Easy care · Peaceful · 5 cm · 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.
  • Bandit Corydoras ✅ Compatible
    Easy care · Peaceful · 5 cm · 22–27 °C (72–81 °F)
    Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
  • Japanese Trapdoor Snail ✅ Compatible
    Easy care · Peaceful · 5 cm · 10–28 °C (50–82 °F)
    Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
  • Julii Corydoras ✅ Compatible
    Easy care · Peaceful · 5 cm · 23–26 °C (73–79 °F)
    Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
  • Masked Corydoras ✅ Compatible
    Easy care · Peaceful · 5 cm · 22–28 °C (72–82 °F)
    Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
  • Skunk Corydoras ✅ Compatible
    Easy care · Peaceful · 5 cm · 22–26 °C (72–79 °F)
    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.
  • Rust Corydoras ✅ Compatible
    Easy care · Peaceful · 5.5 cm · 23–27 °C (73–81 °F)
    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.
  • Agassiz's Corydoras ✅ Compatible
    Easy care · Peaceful · 6 cm · 22–28 °C (72–82 °F)
    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.
  • Elegant Cory ✅ Compatible
    Easy care · Peaceful · 6 cm · 22–28 °C (72–82 °F)
    Compatible on the things that matter: shared water near 23–28 °C, workable temperaments, and no predator-and-prey size gap.
  • False Julii Corydoras ✅ Compatible
    Easy care · Peaceful · 6 cm · 22–26 °C (72–79 °F)
    Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
  • Corydoras Catfish ✅ Compatible
    Easy care · Peaceful · 6.5 cm · 22–26 °C (72–79 °F)
    Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
  • Spotfin Corydoras ✅ Compatible
    Easy care · Peaceful · 6.5 cm · 22–26 °C (72–79 °F)
    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.
  • Peppered Corydoras ✅ Compatible
    Easy care · Peaceful · 7 cm · 18–26 °C (64–79 °F)
    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.
  • Spotted Corydoras ✅ Compatible
    Easy care · Peaceful · 7 cm · 22–27 °C (72–81 °F)
    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.
  • Black Kuhli Loach ✅ Compatible
    Easy care · Peaceful · 8 cm · 23–28 °C (73–82 °F)
    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.
  • Burmese Loach ✅ Compatible
    Easy care · Peaceful · 9 cm · 22–28 °C (72–82 °F)
    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.
  • Kuhli Loach ✅ Compatible
    Easy care · Peaceful · 10 cm · 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.
  • Porthole Catfish ✅ Compatible
    Easy care · Peaceful · 10 cm · 22–28 °C (72–82 °F)
    Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
  • Upside-down Catfish ✅ Compatible
    Easy care · Peaceful · 10 cm · 22–26 °C (72–79 °F)
    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.
  • Bristlenose Pleco ✅ Compatible
    Easy care · Peaceful · 12 cm · 23–30 °C (73–86 °F)
    Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
  • Giant Kuhli Loach ✅ Compatible
    Easy care · Peaceful · 12 cm · 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.
  • Rubber Lip Pleco ✅ Compatible
    Easy care · Peaceful · 12 cm · 20–26 °C (68–79 °F)
    Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
  • Marbled Hoplo ✅ Compatible
    Easy care · Peaceful · 14 cm · 22–28 °C (72–82 °F)
    Compatible on the things that matter: shared water near 23–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Spotted Talking Catfish ✅ Compatible
    Easy care · Peaceful · 15 cm · 22–26 °C (72–79 °F)
    Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
With caution

Bucktooth Tetra tank mates that can work with care

  • Amano Shrimp ⚠️ With caution
    Easy care · Peaceful · 5 cm · 18–28 °C (64–82 °F)
    Adult Amano Shrimp might survive with Bucktooth Tetra, but expect the young to be eaten — plant heavily.
  • Amazon Puffer ⚠️ With caution
    Medium care · Peaceful · 8 cm · 23–28 °C (73–82 °F)
    Bucktooth Tetra is aggressive and may chase or nip the smaller Amazon Puffer — plant heavily and break up sight lines.
  • Assassin Snail ⚠️ With caution
    Easy care · Peaceful · 3 cm · 22–26 °C (72–79 °F)
    Bucktooth Tetra may bully the smaller Assassin Snail, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Bamboo Shrimp ⚠️ With caution
    Medium care · Peaceful · 8 cm · 22–27 °C (72–81 °F)
    Bucktooth Tetra and Bamboo Shrimp are close in size, but the aggressive one tends to dominate — add bamboo shrimp in a group to spread the pressure.
  • Blackline Rasbora ⚠️ With caution
    Easy care · Peaceful · 6 cm · 22–28 °C (72–82 °F)
    Bucktooth Tetra is aggressive and may chase or nip the smaller Blackline Rasbora — plant heavily and break up sight lines.
  • Bloodfin Tetra ⚠️ With caution
    Easy care · Peaceful · 5.5 cm · 18–28 °C (64–82 °F)
    Bucktooth Tetra is aggressive and may chase or nip the smaller Bloodfin Tetra — plant heavily and break up sight lines.
  • Boesemani Rainbowfish ⚠️ With caution
    Medium care · Peaceful · 11 cm · 24–28 °C (75–82 °F)
    Expect Bucktooth Tetra to harass Boesemani Rainbowfish at times; give dense cover and watch them at feeding.
  • Bright Diamond Tetra ⚠️ With caution
    Hard care · Peaceful · 7 cm · 24–28 °C (75–82 °F)
    Bucktooth Tetra is aggressive and may chase or nip the smaller Bright Diamond Tetra — plant heavily and break up sight lines.

+ 67 more “with caution” pairings — see the interactive checker above.

Avoid

Fish to avoid keeping with a bucktooth tetra

  • Mekong Giant Catfish ⛔ Avoid
    Hard care · Semi-aggressive · 300 cm · 20–28 °C (68–82 °F)
    Bucktooth Tetra and Mekong Giant Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
  • Wels Catfish ⛔ Avoid
    Hard care · Aggressive · 300 cm · 15–25 °C (59–77 °F)
    Bucktooth Tetra and Wels Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
  • Alligator Gar ⛔ Avoid
    Hard care · Aggressive · 250 cm · 24–28 °C (75–82 °F)
    Bucktooth Tetra and Alligator Gar are both territorial and at least one is outright aggressive — expect serious fighting.
  • Redtail Catfish ⛔ Avoid
    Hard care · Aggressive · 120 cm · 24–27 °C (75–81 °F)
    Bucktooth Tetra and Redtail Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
  • Fire Eel ⛔ Avoid
    Medium care · Semi-aggressive · 100 cm · 24–28 °C (75–82 °F)
    Two assertive fish, one genuinely aggressive: Bucktooth Tetra and Fire Eel will hold territory and clash.
  • Clown Knifefish ⛔ Avoid
    Hard care · Aggressive · 90 cm · 24–28 °C (75–82 °F)
    Two assertive fish, one genuinely aggressive: Bucktooth Tetra and Clown Knifefish will hold territory and clash.
  • Koi ⛔ Avoid
    Medium care · Peaceful · 90 cm · 4–28 °C (39–82 °F)
    Bucktooth Tetra is bite-sized to a 90 cm koi — it will be eaten.
  • Spotted Gar ⛔ Avoid
    Hard care · Aggressive · 90 cm · 18–26 °C (64–79 °F)
    Bucktooth Tetra and Spotted Gar are both territorial and at least one is outright aggressive — expect serious fighting.

+ 211 more to avoid — the checker above flags every one.

Interactive tool

Check any fish against a bucktooth tetra

Dial in your exact tank size and filter by result — the checker scores every species in our database against a bucktooth tetra, with the reasoning for each verdict.

Tank-mate checker

Will it live with a Bucktooth Tetra?

We compare each fish against your bucktooth tetra on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.

  • Banjo Catfish✅ Compatible
    Peaceful · 15 cm · Medium care · 20–26 °C (68–79 °F)
    • Compatible on the things that matter: shared water near 23–26 °C, workable temperaments, and no predator-and-prey size gap.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Bearded Corydoras✅ Compatible
    Peaceful · 10 cm · Medium care · 18–24 °C (64–75 °F)
    • Compatible on the things that matter: shared water near 23–24 °C, workable temperaments, and no predator-and-prey size gap.
    • Keep Bucktooth Tetra in a shoal of 8+ 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)
    • 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 Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Bolivian Ram✅ Compatible
    Peaceful · 8 cm · Medium care · 24–28 °C (75–82 °F)
    • 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 Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Bristlenose Pleco✅ Compatible
    Peaceful · 12 cm · Easy care · 23–30 °C (73–86 °F)
    • Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Burmese Loach✅ Compatible
    Peaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
    • 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 Bucktooth Tetra in a shoal of 8+ 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 24–28 °C, workable temperaments, and no predator-and-prey size gap.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Giant Kuhli Loach✅ Compatible
    Peaceful · 12 cm · Easy 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 Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Kuhli Loach✅ Compatible
    Peaceful · 10 cm · Easy 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 Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Leopard Frog Pleco✅ Compatible
    Peaceful · 9 cm · Medium care · 25–30 °C (77–86 °F)
    • Compatible on the things that matter: shared water near 25–28 °C, workable temperaments, and no predator-and-prey size gap.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Marbled Hoplo✅ Compatible
    Peaceful · 14 cm · Easy care · 22–28 °C (72–82 °F)
    • Compatible on the things that matter: shared water near 23–28 °C, workable temperaments, and no predator-and-prey size gap.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Medusa Pleco✅ Compatible
    Peaceful · 12 cm · Medium care · 26–30 °C (79–86 °F)
    • 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 Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Pantanal Corydoras✅ Compatible
    Peaceful · 8 cm · Medium care · 22–27 °C (72–81 °F)
    • 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 Bucktooth Tetra in a shoal of 8+ 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)
    • 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 Bucktooth Tetra in a shoal of 8+ 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)
    • Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Rubber Lip Pleco✅ Compatible
    Peaceful · 12 cm · Easy care · 20–26 °C (68–79 °F)
    • Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Snowball Pleco✅ Compatible
    Peaceful · 16 cm · Medium care · 24–30 °C (75–86 °F)
    • 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 Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Spotted Corydoras✅ Compatible
    Peaceful · 7 cm · Easy care · 22–27 °C (72–81 °F)
    • 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 Bucktooth Tetra in a shoal of 8+ 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)
    • Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Spotted Talking Catfish✅ Compatible
    Peaceful · 15 cm · Easy care · 22–26 °C (72–79 °F)
    • Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Striped Eel Loach✅ Compatible
    Peaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
    • 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 Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Upside-down Catfish✅ Compatible
    Peaceful · 10 cm · Easy care · 22–26 °C (72–79 °F)
    • 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 Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Zebra Loach✅ Compatible
    Peaceful · 9 cm · Medium care · 23–26 °C (73–79 °F)
    • Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Zebra Pleco✅ Compatible
    Peaceful · 10 cm · Hard care · 26–30 °C (79–86 °F)
    • Aggressive + Peaceful, but with no direct clash here, and their water overlaps around 26–28 °C — no size, zone or temperament conflicts.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Amazon Puffer⚠️ With caution
    Peaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
    • Bucktooth Tetra is aggressive and may chase or nip the smaller Amazon Puffer — plant heavily and break up sight lines.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
    • Keep Amazon Puffer in a shoal of 6+ or it gets stressed and nippy.
  • Boesemani Rainbowfish⚠️ With caution
    Peaceful · 11 cm · Medium care · 24–28 °C (75–82 °F)
    • Expect Bucktooth Tetra to harass Boesemani Rainbowfish at times; give dense cover and watch them at feeding.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
    • Keep Boesemani Rainbowfish 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)
    • Bucktooth Tetra and Brilliant Rasbora are close in size, but the aggressive one tends to dominate — add brilliant rasbora in a group to spread the pressure.
    • Keep Bucktooth Tetra in a shoal of 8+ 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)
    • Bucktooth Tetra is aggressive and may chase or nip the smaller Clown Rasbora — plant heavily and break up sight lines.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
    • Keep Clown Rasbora in a shoal of 6+ or it gets stressed and nippy.
  • Denison Barb⚠️ With caution
    Peaceful · 15 cm · Medium care · 18–25 °C (64–77 °F)
    • Bucktooth Tetra is a notorious fin-nipper — even though Denison Barb is larger, an active shoal will harass its trailing fins. Only safe in a full group of 8+ with plenty of cover.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
    • Keep Denison Barb in a shoal of 6+ or it gets stressed and nippy.
  • Giant Betta⚠️ With caution
    Peaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
    • Expect Bucktooth Tetra to harass Giant Betta at times; give dense cover and watch them at feeding.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Giant Danio⚠️ With caution
    Peaceful · 10 cm · Easy care · 20–27 °C (68–81 °F)
    • Bucktooth Tetra and Giant Danio are close in size, but the aggressive one tends to dominate — add giant danio in a group to spread the pressure.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
    • Keep Giant Danio in a shoal of 6+ or it gets stressed and nippy.
  • Giant Glass Catfish⚠️ With caution
    Peaceful · 15 cm · Medium care · 22–27 °C (72–81 °F)
    • Giant Glass Catfish is slow and long-finned; a busy bucktooth tetra shoal tends to nip at it. Keep bucktooth tetra in a proper group of 8+ and watch them closely.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Keyhole Cichlid⚠️ With caution
    Peaceful · 10 cm · Easy care · 22–28 °C (72–82 °F)
    • Bucktooth Tetra is aggressive and may chase or nip the smaller Keyhole Cichlid — plant heavily and break up sight lines.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Mascara Barb⚠️ With caution
    Peaceful · 12 cm · Medium care · 20–25 °C (68–77 °F)
    • Expect Bucktooth Tetra to harass Mascara Barb at times; give dense cover and watch them at feeding.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
    • Keep Mascara Barb in a shoal of 8+ or it gets stressed and nippy.
  • Molly⚠️ With caution
    Peaceful · 10 cm · Easy care · 23–28 °C (73–82 °F)
    • Expect Bucktooth Tetra to harass Molly at times; give dense cover and watch them at feeding.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Moonlight Gourami⚠️ With caution
    Peaceful · 15 cm · Easy care · 25–30 °C (77–86 °F)
    • Bucktooth Tetra is a notorious fin-nipper — even though Moonlight Gourami is larger, an active shoal will harass its trailing fins. Only safe in a full group of 8+ with plenty of cover.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Murray River Rainbowfish⚠️ With caution
    Peaceful · 11 cm · Easy care · 15–26 °C (59–79 °F)
    • Bucktooth Tetra and Murray River Rainbowfish are close in size, but the aggressive one tends to dominate — add murray river rainbowfish in a group to spread the pressure.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
    • Keep Murray River Rainbowfish in a shoal of 6+ or it gets stressed and nippy.
  • Pearl Gourami⚠️ With caution
    Peaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
    • Bucktooth Tetra and Pearl Gourami are close in size, but the aggressive one tends to dominate — add pearl gourami in a group to spread the pressure.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Silver Tetra⚠️ With caution
    Peaceful · 9 cm · Easy care · 24–28 °C (75–82 °F)
    • Bucktooth Tetra is aggressive and may chase or nip the smaller Silver Tetra — plant heavily and break up sight lines.
    • Keep Bucktooth Tetra in a shoal of 8+ 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)
    • Bucktooth Tetra is aggressive and may chase or nip the smaller Thick-lipped Gourami — plant heavily and break up sight lines.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Alligator Gar⛔ Not recommended
    Aggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
    • Bucktooth 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 12 cm Bucktooth Tetra whole.
    • Bucktooth 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 8+ with plenty of cover.
    • Your 200 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
    • Keep Bucktooth Tetra in a shoal of 8+ 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: Bucktooth Tetra and Clown Knifefish will hold territory and clash.
    • Clown Knifefish (90 cm) is big enough to swallow the 12 cm Bucktooth Tetra whole.
    • Your 200 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Fire Eel⛔ Not recommended
    Semi-aggressive · 100 cm · Medium care · 24–28 °C (75–82 °F)
    • Two assertive fish, one genuinely aggressive: Bucktooth Tetra and Fire Eel will hold territory and clash.
    • Size gap is too large (100 vs 12 cm): Fire Eel will treat Bucktooth Tetra as food.
    • Your 200 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Koi⛔ Not recommended
    Peaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
    • Bucktooth Tetra is bite-sized to a 90 cm koi — it will be eaten.
    • Koi is slow and long-finned; a busy bucktooth tetra shoal tends to nip at it. Keep bucktooth tetra in a proper group of 8+ and watch them closely.
    • Your 200 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Mekong Giant Catfish⛔ Not recommended
    Semi-aggressive · 300 cm · Hard care · 20–28 °C (68–82 °F)
    • Bucktooth Tetra and Mekong Giant Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
    • Bucktooth Tetra is a notorious fin-nipper — even though Mekong Giant Catfish is larger, an active shoal will harass its trailing fins. Only safe in a full group of 8+ with plenty of cover.
    • Your 200 L tank is below the ~100000 L this pairing really wants — crowding raises aggression.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Redtail Catfish⛔ Not recommended
    Aggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
    • Bucktooth 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 12 cm Bucktooth Tetra whole.
    • Your 200 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Spotted Gar⛔ Not recommended
    Aggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
    • Bucktooth 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 12 cm Bucktooth Tetra whole.
    • Bucktooth 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 8+ with plenty of cover.
    • Your 200 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
    • Keep Bucktooth Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Wels Catfish⛔ Not recommended
    Aggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
    • Bucktooth Tetra and Wels Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
    • Size gap is too large (300 vs 12 cm): Wels Catfish will treat Bucktooth Tetra as food.
    • Your 200 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
    • Keep Bucktooth Tetra in a shoal of 8+ 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.

Setting up a bucktooth tetra community tank

Give the group a stable, planted 200 L+ tank with a gentle filter, a reliable heater and plenty of cover — broken sight lines and hiding spots let mid-water and bottom dwellers keep out of each other's way. Cycle it fully and stock gradually.

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How to choose

How to choose the right tank mates for a bucktooth tetra

Bucktooth Tetra is aggressive and territorial, so most community fish are unsafe; any tank mate must be large, tough and able to hold its own. It mostly occupies the middle of the tank, so it pairs naturally with species that use the other levels.

Bucktooth Tetra grows to about 12 cm, so avoid tank mates small enough to be seen as food — as a rule of thumb, skip anything under roughly 6 cm. Match its water, too: aim for 23–28 °C (73–82 °F), pH 6–7.5 and 2–12 dGH. Fish needing very different conditions — coldwater species, or hard-water lovers against a soft-water fish — rarely thrive side by side.

Bucktooth Tetra is a shoaling fish — stock a group of 8+ of its own kind first, then build compatible tank mates around them. Whatever you add, introduce new fish slowly, watch for bullying in the first days, and have a backup plan if temperaments clash.

FAQ

Frequently asked questions

Can a bucktooth tetra live with other fish?

Yes — with the right companions. Our checker finds 46 compatible freshwater species for bucktooth tetra. Pick calm, similarly-sized fish that share its water needs and add them to a mature, well-planted tank.

What is the best tank mate for a bucktooth tetra?

Easy, peaceful, similarly-sized species top the list — for example Axelrod's Cory, Bandit Corydoras, Japanese Trapdoor Snail. Use the checker above to match against your own tank size.

What fish should you avoid keeping with a bucktooth tetra?

Avoid Mekong Giant Catfish, Wels Catfish, Alligator Gar and similar — usually a temperature, size or temperament clash. The full "avoid" list below gives the reason for each.

How big a tank do bucktooth tetra tank mates need?

Start from Bucktooth Tetra's own minimum and scale up with every addition. The checker above defaults to a 200 L community tank and flags pairings that need more room — drag the slider to match your setup.

← Back to the full Bucktooth Tetra care guide