Fire Eel Tank Mates

Fire Eel is semi-aggressive, so its tank mates need choosing with care. Here are the 2 freshwater species that pair well with a fire eel — plus the 259 to avoid — with a live checker you can tune to your own tank.

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

The best tank mates for a fire eel

  • Common Pleco ✅ Compatible
    Medium care · Peaceful · 45 cm · 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.
  • Sailfin Pleco ✅ Compatible
    Medium care · Peaceful · 50 cm · 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.
With caution

Fire Eel tank mates that can work with care

  • Adolf's Cory ⚠️ With caution
    Medium care · Peaceful · 5.5 cm · 22–26 °C (72–79 °F)
    Fire Eel 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)
    Fire Eel may bully the smaller Agassiz's Corydoras, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Angelicus Synodontis ⚠️ With caution
    Medium care · Semi-aggressive · 25 cm · 23–27 °C (73–81 °F)
    Fire Eel 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)
    Fire Eel 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)
    Fire Eel 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)
    Fire Eel 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)
    Fire Eel may bully the smaller Bearded Corydoras, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Bichir ⚠️ With caution
    Medium care · Semi-aggressive · 45 cm · 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.

+ 71 more “with caution” pairings — see the interactive checker above.

Avoid

Fish to avoid keeping with a fire eel

  • Wels Catfish ⛔ Avoid
    Hard care · Aggressive · 300 cm · 15–25 °C (59–77 °F)
    Two assertive fish, one genuinely aggressive: Fire Eel 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: Fire Eel 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: Fire Eel and Redtail Catfish will hold territory and clash.
  • Clown Knifefish ⛔ Avoid
    Hard care · Aggressive · 90 cm · 24–28 °C (75–82 °F)
    Fire Eel 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: Fire Eel and Spotted Gar will hold territory and clash.
  • Wolf Cichlid ⛔ Avoid
    Hard care · Aggressive · 72 cm · 24–30 °C (75–86 °F)
    Fire Eel 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)
    Fire Eel 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)
    Fire Eel and Mbu Puffer are both territorial and at least one is outright aggressive — expect serious fighting.

+ 251 more to avoid — the checker above flags every one.

Interactive tool

Check any fish against a fire eel

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

Tank-mate checker

Will it live with a Fire Eel?

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

  • Common Pleco✅ Compatible
    Peaceful · 45 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 bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Sailfin Pleco✅ Compatible
    Peaceful · 50 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 bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Bichir⚠️ 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.
    • Watch for Fire Eel picking off any bichir small enough to fit in its mouth.
  • Black Doras Catfish⚠️ With caution
    Peaceful · 60 cm · Hard care · 22–28 °C (72–82 °F)
    • Your 380 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.
    • Black Ghost Knifefish is small enough to tempt Fire Eel; only risk it in a densely planted setup with hiding spots.
  • 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 380 L tank is below the ~680 L this pairing really wants — crowding raises aggression.
  • Giant Gourami⚠️ With caution
    Semi-aggressive · 70 cm · Medium care · 22–28 °C (72–82 °F)
    • Fire Eel and Giant Gourami can both be territorial; doable with space and dense planting, but watch for chasing.
    • Your 380 L tank is below the ~750 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)
    • Fire Eel and Golden Sailfin Pleco can both be territorial; doable with space and dense planting, but watch for chasing.
  • Koi⚠️ With caution
    Peaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
    • Expect Fire Eel to harass Koi at times; give dense cover and watch them at feeding.
    • Your 380 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
  • 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.
    • Fire Eel may bully the smaller Leopard Cactus Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • 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 380 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 380 L tank is below the ~1500 L this pairing really wants — crowding raises aggression.
  • Mekong Giant Catfish⚠️ With caution
    Semi-aggressive · 300 cm · Hard care · 20–28 °C (68–82 °F)
    • Fire Eel and Mekong Giant Catfish can both be territorial; doable with space and dense planting, but watch for chasing.
    • Your 380 L tank is below the ~100000 L this pairing really wants — crowding raises aggression.
  • Nile Bichir⚠️ With caution
    Semi-aggressive · 70 cm · Medium care · 25–28 °C (77–82 °F)
    • Fire Eel and Nile Bichir can both be territorial; doable with space and dense planting, but watch for chasing.
    • Your 380 L tank is below the ~450 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)
    • Fire Eel and Orinoco Sailfin Pleco can both be territorial; doable with space and dense planting, but watch for chasing.
    • Your 380 L tank is below the ~450 L this pairing really wants — crowding raises aggression.
  • 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.
  • 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 380 L tank is below the ~570 L this pairing really wants — crowding raises aggression.
  • Yellow-spotted Pleco⚠️ With caution
    Peaceful · 35 cm · Medium care · 24–27 °C (75–81 °F)
    • Fire Eel may bully the smaller Yellow-spotted Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Alligator Gar⛔ Not recommended
    Aggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
    • Two assertive fish, one genuinely aggressive: Fire Eel and Alligator Gar will hold territory and clash.
    • Alligator Gar (250 cm) is big enough to swallow the 100 cm Fire Eel whole.
    • Your 380 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)
    • Fire Eel and Clown Knifefish are both territorial and at least one is outright aggressive — expect serious fighting.
    • Your 380 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)
    • Fire Eel and Mbu Puffer are both territorial and at least one is outright aggressive — expect serious fighting.
    • Your 380 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)
    • Fire Eel and Ocellaris Peacock Bass are both territorial and at least one is outright aggressive — expect serious fighting.
    • Your 380 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: Fire Eel and Redtail Catfish will hold territory and clash.
    • Your 380 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: Fire Eel and Spotted Gar will hold territory and clash.
    • Your 380 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: Fire Eel and Wels Catfish will hold territory and clash.
    • Wels Catfish (300 cm) is big enough to swallow the 100 cm Fire Eel whole.
    • Your 380 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)
    • Fire Eel and Wolf Cichlid are both territorial and at least one is outright aggressive — expect serious fighting.
    • Your 380 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 fire eel community tank

Give the group a stable, planted 380 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 fire eel

Being semi-aggressive, fire eel 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.

Fire Eel grows to about 100 cm, so avoid tank mates small enough to be seen as food — as a rule of thumb, skip anything under roughly 50 cm. Match its water, too: aim for 24–28 °C (75–82 °F), pH 6.5–7.5 and 5–15 dGH. Fish needing very different conditions — coldwater species, or hard-water lovers against a soft-water fish — rarely thrive side by side.

Fire Eel 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 fire eel live with other fish?

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

Easy, peaceful, similarly-sized species top the list — for example Common Pleco, Sailfin Pleco. Use the checker above to match against your own tank size.

What fish should you avoid keeping with a fire eel?

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 fire eel tank mates need?

Start from Fire Eel's own minimum and scale up with every addition. The checker above defaults to a 380 L community tank and flags pairings that need more room — drag the slider to match your setup.

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