Bichir Tank Mates

Bichir is semi-aggressive, so its tank mates need choosing with care. Here are the 2 freshwater species that pair well with a bichir — plus the 241 to avoid — with a live checker you can tune to your own tank.

By The Aquarium DB Team • Updated June 7, 2026 • Full Bichir care guide →
Best matches

The best tank mates for a bichir

  • Yellow-spotted Pleco ✅ Compatible
    Medium care · Peaceful · 35 cm · 24–27 °C (75–81 °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.
  • Elephant-nose Knifefish ✅ Compatible
    Hard care · Peaceful · 35 cm · 24–29 °C (75–84 °F)
    Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
With caution

Bichir tank mates that can work with care

  • Adolf's Cory ⚠️ With caution
    Medium care · Peaceful · 5.5 cm · 22–26 °C (72–79 °F)
    Bichir may bully the smaller Adolf's Cory, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Agassiz's Corydoras ⚠️ With caution
    Easy care · Peaceful · 6 cm · 22–28 °C (72–82 °F)
    Bichir may bully the smaller Agassiz's Corydoras, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Altifrons Geophagus ⚠️ With caution
    Medium care · Semi-aggressive · 25 cm · 24–28 °C (75–82 °F)
    Bichir and Altifrons Geophagus can both be territorial; doable with space and dense planting, but watch for chasing.
  • Angelicus Synodontis ⚠️ With caution
    Medium care · Semi-aggressive · 25 cm · 23–27 °C (73–81 °F)
    Bichir and Angelicus Synodontis can both be territorial; doable with space and dense planting, but watch for chasing.
  • Assassin Snail ⚠️ With caution
    Easy care · Peaceful · 3 cm · 22–26 °C (72–79 °F)
    Bichir may bully the smaller Assassin Snail, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Axelrod's Cory ⚠️ With caution
    Easy care · Peaceful · 5 cm · 23–28 °C (73–82 °F)
    Bichir may bully the smaller Axelrod's Cory, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Bandit Corydoras ⚠️ With caution
    Easy care · Peaceful · 5 cm · 22–27 °C (72–81 °F)
    Bichir may bully the smaller Bandit Corydoras, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Bearded Corydoras ⚠️ With caution
    Medium care · Peaceful · 10 cm · 18–24 °C (64–75 °F)
    Bichir may bully the smaller Bearded Corydoras, though its armour makes it a hard meal — give it caves and driftwood to retreat into.

+ 89 more “with caution” pairings — see the interactive checker above.

Avoid

Fish to avoid keeping with a bichir

  • Wels Catfish ⛔ Avoid
    Hard care · Aggressive · 300 cm · 15–25 °C (59–77 °F)
    Two assertive fish, one genuinely aggressive: Bichir and Wels Catfish will hold territory and clash.
  • Alligator Gar ⛔ Avoid
    Hard care · Aggressive · 250 cm · 24–28 °C (75–82 °F)
    Two assertive fish, one genuinely aggressive: Bichir and Alligator Gar will hold territory and clash.
  • Redtail Catfish ⛔ Avoid
    Hard care · Aggressive · 120 cm · 24–27 °C (75–81 °F)
    Two assertive fish, one genuinely aggressive: Bichir and Redtail Catfish will hold territory and clash.
  • Clown Knifefish ⛔ Avoid
    Hard care · Aggressive · 90 cm · 24–28 °C (75–82 °F)
    Bichir and Clown Knifefish are both territorial and at least one is outright aggressive — expect serious fighting.
  • Spotted Gar ⛔ Avoid
    Hard care · Aggressive · 90 cm · 18–26 °C (64–79 °F)
    Two assertive fish, one genuinely aggressive: Bichir and Spotted Gar will hold territory and clash.
  • Wolf Cichlid ⛔ Avoid
    Hard care · Aggressive · 72 cm · 24–30 °C (75–86 °F)
    Bichir and Wolf Cichlid are both territorial and at least one is outright aggressive — expect serious fighting.
  • Ocellaris Peacock Bass ⛔ Avoid
    Hard care · Aggressive · 70 cm · 24–30 °C (75–86 °F)
    Bichir and Ocellaris Peacock Bass are both territorial and at least one is outright aggressive — expect serious fighting.
  • Mbu Puffer ⛔ Avoid
    Hard care · Aggressive · 67 cm · 24–28 °C (75–82 °F)
    Bichir and Mbu Puffer are both territorial and at least one is outright aggressive — expect serious fighting.

+ 233 more to avoid — the checker above flags every one.

Interactive tool

Check any fish against a bichir

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

Tank-mate checker

Will it live with a Bichir?

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

  • Elephant-nose Knifefish✅ Compatible
    Peaceful · 35 cm · Hard care · 24–29 °C (75–84 °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 bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Yellow-spotted Pleco✅ Compatible
    Peaceful · 35 cm · Medium care · 24–27 °C (75–81 °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 bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Black Doras Catfish⚠️ With caution
    Peaceful · 60 cm · Hard care · 22–28 °C (72–82 °F)
    • Your 300 L tank is below the ~500 L this pairing really wants — crowding raises aggression.
  • Black Ghost Knifefish⚠️ With caution
    Semi-aggressive · 45 cm · Hard care · 24–28 °C (75–82 °F)
    • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
    • Your 300 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
  • Butter Catfish⚠️ With caution
    Semi-aggressive · 45 cm · Medium care · 24–28 °C (75–82 °F)
    • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
    • Your 300 L tank is below the ~680 L this pairing really wants — crowding raises aggression.
  • Clown Loach⚠️ With caution
    Peaceful · 30 cm · Medium care · 25–30 °C (77–86 °F)
    • Your 300 L tank is below the ~400 L this pairing really wants — crowding raises aggression.
  • Common Pleco⚠️ With caution
    Peaceful · 45 cm · Medium care · 22–28 °C (72–82 °F)
    • Your 300 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
  • Golden Sailfin Pleco⚠️ With caution
    Semi-aggressive · 45 cm · Medium care · 22–28 °C (72–82 °F)
    • Bichir and Golden Sailfin Pleco can both be territorial; doable with space and dense planting, but watch for chasing.
  • Kissing Gourami⚠️ With caution
    Semi-aggressive · 30 cm · Medium 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.
  • Leopard Cactus Pleco⚠️ With caution
    Semi-aggressive · 30 cm · Hard 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.
    • Your 300 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
  • Lima Shovelnose Catfish⚠️ With caution
    Semi-aggressive · 50 cm · Hard care · 23–30 °C (73–86 °F)
    • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
    • Your 300 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
  • Lyre Tail Pleco⚠️ With caution
    Semi-aggressive · 63 cm · Hard care · 21–27 °C (70–81 °F)
    • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
    • Your 300 L tank is below the ~1500 L this pairing really wants — crowding raises aggression.
  • Orinoco Sailfin Pleco⚠️ With caution
    Semi-aggressive · 50 cm · Medium care · 22–28 °C (72–82 °F)
    • Bichir and Orinoco Sailfin Pleco can both be territorial; doable with space and dense planting, but watch for chasing.
    • Your 300 L tank is below the ~450 L this pairing really wants — crowding raises aggression.
  • Peacock Eel⚠️ With caution
    Semi-aggressive · 30 cm · Medium 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.
  • Royal Pleco⚠️ With caution
    Semi-aggressive · 43 cm · Medium care · 23–28 °C (73–82 °F)
    • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
    • Your 300 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
  • Sailfin Pleco⚠️ With caution
    Peaceful · 50 cm · Medium care · 22–28 °C (72–82 °F)
    • Your 300 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
  • Spotted Shovelnose Catfish⚠️ With caution
    Semi-aggressive · 55 cm · Hard 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.
    • Your 300 L tank is below the ~570 L this pairing really wants — crowding raises aggression.
  • True Parrot Cichlid⚠️ With caution
    Semi-aggressive · 33 cm · Hard care · 23–28 °C (73–82 °F)
    • Bichir and True Parrot Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
    • Your 300 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
  • Alligator Gar⛔ Not recommended
    Aggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
    • Two assertive fish, one genuinely aggressive: Bichir and Alligator Gar will hold territory and clash.
    • Size gap is too large (250 vs 45 cm): Alligator Gar will treat Bichir as food.
    • Your 300 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
  • Clown Knifefish⛔ Not recommended
    Aggressive · 90 cm · Hard care · 24–28 °C (75–82 °F)
    • Bichir and Clown Knifefish are both territorial and at least one is outright aggressive — expect serious fighting.
    • Clown Knifefish may hunt Bichir, fry or shrimplets — safest in a heavily planted tank.
    • Your 300 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
  • Mbu Puffer⛔ Not recommended
    Aggressive · 67 cm · Hard care · 24–28 °C (75–82 °F)
    • Bichir and Mbu Puffer are both territorial and at least one is outright aggressive — expect serious fighting.
    • Your 300 L tank is below the ~757 L this pairing really wants — crowding raises aggression.
  • Ocellaris Peacock Bass⛔ Not recommended
    Aggressive · 70 cm · Hard care · 24–30 °C (75–86 °F)
    • Bichir and Ocellaris Peacock Bass are both territorial and at least one is outright aggressive — expect serious fighting.
    • Your 300 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
  • Redtail Catfish⛔ Not recommended
    Aggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
    • Two assertive fish, one genuinely aggressive: Bichir and Redtail Catfish will hold territory and clash.
    • Bichir is bite-sized to a 120 cm predatory redtail catfish — it will be eaten.
    • Your 300 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
  • Spotted Gar⛔ Not recommended
    Aggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
    • Two assertive fish, one genuinely aggressive: Bichir and Spotted Gar will hold territory and clash.
    • Bichir is small enough to tempt Spotted Gar; only risk it in a densely planted setup with hiding spots.
    • Your 300 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
  • Wels Catfish⛔ Not recommended
    Aggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
    • Two assertive fish, one genuinely aggressive: Bichir and Wels Catfish will hold territory and clash.
    • Bichir is bite-sized to a 300 cm predatory wels catfish — it will be eaten.
    • Your 300 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
  • Wolf Cichlid⛔ Not recommended
    Aggressive · 72 cm · Hard care · 24–30 °C (75–86 °F)
    • Bichir and Wolf Cichlid are both territorial and at least one is outright aggressive — expect serious fighting.
    • Watch for Wolf Cichlid picking off any bichir small enough to fit in its mouth.
    • Your 300 L tank is below the ~760 L this pairing really wants — crowding raises aggression.

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 bichir community tank

Give the group a stable, planted 300 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 bichir

Being semi-aggressive, bichir can nip or harass smaller, slower or long-finned fish — give it space, broken sight-lines and similarly robust companions. It mostly occupies the bottom of the tank, so it pairs naturally with species that use the other levels.

Bichir grows to about 45 cm, so avoid tank mates small enough to be seen as food — as a rule of thumb, skip anything under roughly 23 cm. Match its water, too: aim for 24–28 °C (75–82 °F), pH 6.5–7.5 and 5–19 dGH. Fish needing very different conditions — coldwater species, or hard-water lovers against a soft-water fish — rarely thrive side by side.

Bichir doesn't need its own kind to feel secure; think twice before keeping more than one if it is territorial. 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 bichir live with other fish?

Yes — with the right companions. Our checker finds 2 compatible freshwater species for bichir. 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 bichir?

Easy, peaceful, similarly-sized species top the list — for example Yellow-spotted Pleco, Elephant-nose Knifefish. Use the checker above to match against your own tank size.

What fish should you avoid keeping with a bichir?

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

How big a tank do bichir tank mates need?

Start from Bichir's own minimum and scale up with every addition. The checker above defaults to a 300 L community tank and flags pairings that need more room — drag the slider to match your setup.

← Back to the full Bichir care guide