Firemouth Cichlid Tank Mates

Firemouth Cichlid is semi-aggressive, so its tank mates need choosing with care. Here are the 27 freshwater species that pair well with a firemouth cichlid — plus the 62 to avoid — with a live checker you can tune to your own tank.

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

The best tank mates for a firemouth cichlid

  • Corydoras Catfish ✅ Compatible
    Easy care · Peaceful · 6.5 cm · 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.
  • Spotfin Corydoras ✅ Compatible
    Easy care · Peaceful · 6.5 cm · 22–26 °C (72–79 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
  • Peppered Corydoras ✅ Compatible
    Easy care · Peaceful · 7 cm · 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.
  • Spotted Corydoras ✅ Compatible
    Easy care · Peaceful · 7 cm · 22–27 °C (72–81 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
  • Burmese Loach ✅ Compatible
    Easy care · Peaceful · 9 cm · 22–28 °C (72–82 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
  • Kuhli Loach ✅ Compatible
    Easy care · Peaceful · 10 cm · 24–30 °C (75–86 °F)
    Compatible on the things that matter: shared water near 24–29 °C, workable temperaments, and no predator-and-prey size gap.
  • Porthole Catfish ✅ Compatible
    Easy care · Peaceful · 10 cm · 22–28 °C (72–82 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
  • Upside-down Catfish ✅ Compatible
    Easy care · Peaceful · 10 cm · 22–26 °C (72–79 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
  • Bristlenose Pleco ✅ Compatible
    Easy care · Peaceful · 12 cm · 23–30 °C (73–86 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–29 °C — no size, zone or temperament conflicts.
  • Giant Kuhli Loach ✅ Compatible
    Easy care · Peaceful · 12 cm · 24–30 °C (75–86 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–29 °C — no size, zone or temperament conflicts.
  • Rubber Lip Pleco ✅ Compatible
    Easy care · Peaceful · 12 cm · 20–26 °C (68–79 °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.
  • Marbled Hoplo ✅ Compatible
    Easy care · Peaceful · 14 cm · 22–28 °C (72–82 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
  • Spotted Talking Catfish ✅ Compatible
    Easy care · Peaceful · 15 cm · 22–26 °C (72–79 °F)
    Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
  • Weather Loach ✅ Compatible
    Easy care · Peaceful · 25 cm · 5–24 °C (41–75 °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.
  • Sterbai Corydoras ✅ Compatible
    Medium care · Peaceful · 6.5 cm · 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.
  • Pantanal Corydoras ✅ Compatible
    Medium care · Peaceful · 8 cm · 22–27 °C (72–81 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
  • Clown Pleco ✅ Compatible
    Medium care · Peaceful · 9 cm · 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.
  • Leopard Frog Pleco ✅ Compatible
    Medium care · Peaceful · 9 cm · 25–30 °C (77–86 °F)
    Compatible on the things that matter: shared water near 25–29 °C, workable temperaments, and no predator-and-prey size gap.
  • Zebra Loach ✅ Compatible
    Medium care · Peaceful · 9 cm · 23–26 °C (73–79 °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.
  • Bearded Corydoras ✅ Compatible
    Medium care · Peaceful · 10 cm · 18–24 °C (64–75 °F)
    Compatible on the things that matter: shared water near 22–24 °C, workable temperaments, and no predator-and-prey size gap.
  • Medusa Pleco ✅ Compatible
    Medium care · Peaceful · 12 cm · 26–30 °C (79–86 °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.
  • Spotted Rubbernose Pleco ✅ Compatible
    Medium care · Peaceful · 12 cm · 20–26 °C (68–79 °F)
    Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
  • Striped Eel Loach ✅ Compatible
    Medium care · Peaceful · 12 cm · 24–28 °C (75–82 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
  • Banjo Catfish ✅ Compatible
    Medium care · Peaceful · 15 cm · 20–26 °C (68–79 °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.
With caution

Firemouth Cichlid tank mates that can work with care

  • Adolf's Cory ⚠️ With caution
    Medium care · Peaceful · 5.5 cm · 22–26 °C (72–79 °F)
    Firemouth Cichlid may bully the smaller Adolf's Cory, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Afra Cichlid ⚠️ With caution
    Medium care · Semi-aggressive · 10 cm · 24–28 °C (75–82 °F)
    Firemouth Cichlid and Afra Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
  • African Butterfly Cichlid ⚠️ With caution
    Medium care · Semi-aggressive · 8 cm · 22–28 °C (72–82 °F)
    Firemouth Cichlid and African Butterfly Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
  • African Dwarf Frog ⚠️ With caution
    Medium care · Peaceful · 4 cm · 22–26 °C (72–79 °F)
    African Dwarf Frog is small enough to tempt Firemouth Cichlid; only risk it in a densely planted setup with hiding spots.
  • Agassiz's Corydoras ⚠️ With caution
    Easy care · Peaceful · 6 cm · 22–28 °C (72–82 °F)
    Firemouth Cichlid may bully the smaller Agassiz's Corydoras, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Agassiz's Dwarf Cichlid ⚠️ With caution
    Medium care · Semi-aggressive · 9 cm · 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.
  • Altifrons Geophagus ⚠️ With caution
    Medium care · Semi-aggressive · 25 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.
  • Amano Shrimp ⚠️ With caution
    Easy care · Peaceful · 5 cm · 18–28 °C (64–82 °F)
    Adult Amano Shrimp might survive with Firemouth Cichlid, but expect the young to be eaten — plant heavily.

+ 243 more “with caution” pairings — see the interactive checker above.

Avoid

Fish to avoid keeping with a firemouth cichlid

  • Wels Catfish ⛔ Avoid
    Hard care · Aggressive · 300 cm · 15–25 °C (59–77 °F)
    Firemouth Cichlid 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)
    Firemouth Cichlid 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)
    Firemouth Cichlid 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)
    Firemouth Cichlid is bite-sized to a 100 cm predatory fire eel — it will be eaten.
  • Clown Knifefish ⛔ Avoid
    Hard care · Aggressive · 90 cm · 24–28 °C (75–82 °F)
    Two assertive fish, one genuinely aggressive: Firemouth Cichlid and Clown Knifefish will hold territory and clash.
  • Koi ⛔ Avoid
    Medium care · Peaceful · 90 cm · 4–28 °C (39–82 °F)
    Firemouth Cichlid 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)
    Firemouth Cichlid and Spotted Gar are both territorial and at least one is outright aggressive — expect serious fighting.
  • Wolf Cichlid ⛔ Avoid
    Hard care · Aggressive · 72 cm · 24–30 °C (75–86 °F)
    Two assertive fish, one genuinely aggressive: Firemouth Cichlid and Wolf Cichlid will hold territory and clash.

+ 54 more to avoid — the checker above flags every one.

Interactive tool

Check any fish against a firemouth cichlid

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

Tank-mate checker

Will it live with a Firemouth Cichlid?

We compare each fish against your firemouth cichlid 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)
    • 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.
  • Bearded Corydoras✅ Compatible
    Peaceful · 10 cm · Medium care · 18–24 °C (64–75 °F)
    • Compatible on the things that matter: shared water near 22–24 °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.
    • Keep Bearded Corydoras 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)
    • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 23–29 °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.
  • 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 22–28 °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.
  • 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.
    • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Discus✅ Compatible
    Peaceful · 20 cm · Hard care · 28–31 °C (82–88 °F)
    • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 28–29 °C — no size, zone or temperament conflicts.
    • Keep Discus 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 24–29 °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.
  • Kuhli Loach✅ Compatible
    Peaceful · 10 cm · Easy care · 24–30 °C (75–86 °F)
    • Compatible on the things that matter: shared water near 24–29 °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.
  • Leopard Frog Pleco✅ Compatible
    Peaceful · 9 cm · Medium care · 25–30 °C (77–86 °F)
    • Compatible on the things that matter: shared water near 25–29 °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.
  • Marbled Hoplo✅ Compatible
    Peaceful · 14 cm · Easy care · 22–28 °C (72–82 °F)
    • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–28 °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.
  • Medusa Pleco✅ Compatible
    Peaceful · 12 cm · Medium care · 26–30 °C (79–86 °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.
    • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Pantanal Corydoras✅ Compatible
    Peaceful · 8 cm · Medium care · 22–27 °C (72–81 °F)
    • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–27 °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.
    • 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; 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.
    • 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)
    • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–28 °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.
  • Rubber Lip Pleco✅ Compatible
    Peaceful · 12 cm · Easy care · 20–26 °C (68–79 °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 bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Snowball Pleco✅ Compatible
    Peaceful · 16 cm · Medium care · 24–30 °C (75–86 °F)
    • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–29 °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.
  • Spotted Corydoras✅ Compatible
    Peaceful · 7 cm · Easy care · 22–27 °C (72–81 °F)
    • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–27 °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.
    • 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)
    • Compatible on the things that matter: shared water near 22–26 °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.
  • Spotted Talking Catfish✅ Compatible
    Peaceful · 15 cm · Easy care · 22–26 °C (72–79 °F)
    • Compatible on the things that matter: shared water near 22–26 °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.
  • 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 24–28 °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.
  • Upside-down Catfish✅ Compatible
    Peaceful · 10 cm · Easy care · 22–26 °C (72–79 °F)
    • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–26 °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.
  • Weather Loach✅ Compatible
    Peaceful · 25 cm · Easy care · 5–24 °C (41–75 °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.
    • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Zebra Loach✅ Compatible
    Peaceful · 9 cm · Medium care · 23–26 °C (73–79 °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 bottom of the tank — offer enough cover so they aren't always in each other's space.
  • Zebra Pleco✅ Compatible
    Peaceful · 10 cm · Hard care · 26–30 °C (79–86 °F)
    • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 26–29 °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.
  • Angelfish⚠️ With caution
    Semi-aggressive · 15 cm · Medium care · 24–30 °C (75–86 °F)
    • Firemouth Cichlid and Angelfish can both be territorial; doable with space and dense planting, but watch for chasing.
  • Blue Flash Cichlid⚠️ With caution
    Semi-aggressive · 15 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 200 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
  • Calvus Cichlid⚠️ With caution
    Semi-aggressive · 14 cm · Medium care · 24–27 °C (75–81 °F)
    • Firemouth Cichlid and Calvus Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
  • Clown Barb⚠️ With caution
    Semi-aggressive · 15 cm · Medium care · 24–30 °C (75–86 °F)
    • Firemouth Cichlid and Clown Barb can both be territorial; doable with space and dense planting, but watch for chasing.
    • Keep Clown Barb 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)
    • Firemouth Cichlid is semi-aggressive and may chase or nip the smaller Denison Barb — plant heavily and break up sight lines.
    • Keep Denison Barb in a shoal of 6+ or it gets stressed and nippy.
  • Dolphin Cichlid⚠️ With caution
    Semi-aggressive · 15 cm · Medium care · 23–28 °C (73–82 °F)
    • Firemouth Cichlid and Dolphin Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
    • Your 200 L tank is below the ~208 L this pairing really wants — crowding raises aggression.
  • Electric Blue Acara⚠️ With caution
    Semi-aggressive · 16 cm · Medium care · 22–28 °C (72–82 °F)
    • Firemouth Cichlid and Electric Blue Acara can both be territorial; doable with space and dense planting, but watch for chasing.
  • Emperor Peacock Cichlid⚠️ With caution
    Semi-aggressive · 16 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 200 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
  • Eureka Red Peacock Cichlid⚠️ With caution
    Semi-aggressive · 15 cm · Medium care · 24–28 °C (75–82 °F)
    • Firemouth Cichlid and Eureka Red Peacock Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
  • Giant Glass Catfish⚠️ With caution
    Peaceful · 15 cm · Medium care · 22–27 °C (72–81 °F)
    • Firemouth Cichlid is semi-aggressive and may chase or nip the smaller Giant Glass Catfish — plant heavily and break up sight lines.
  • Gold Zebra Loach⚠️ With caution
    Semi-aggressive · 15 cm · Medium care · 25–29 °C (77–84 °F)
    • Firemouth Cichlid and Gold Zebra Loach can both be territorial; doable with space and dense planting, but watch for chasing.
  • Green Phantom Pleco⚠️ With caution
    Semi-aggressive · 15 cm · Medium care · 26–30 °C (79–86 °F)
    • Firemouth Cichlid and Green Phantom Pleco can both be territorial; doable with space and dense planting, but watch for chasing.
  • Moonlight Gourami⚠️ With caution
    Peaceful · 15 cm · Easy care · 25–30 °C (77–86 °F)
    • Expect Firemouth Cichlid to harass Moonlight Gourami at times; give dense cover and watch them at feeding.
  • Rainbow Cichlid⚠️ With caution
    Semi-aggressive · 14 cm · Easy care · 22–28 °C (72–82 °F)
    • Firemouth Cichlid and Rainbow Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
  • Swordtail⚠️ With caution
    Semi-aggressive · 14 cm · Easy care · 22–28 °C (72–82 °F)
    • Firemouth Cichlid and Swordtail can both be territorial; doable with space and dense planting, but watch for chasing.
  • Yoyo Loach⚠️ With caution
    Semi-aggressive · 15 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.
  • Alligator Gar⛔ Not recommended
    Aggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
    • Firemouth Cichlid and Alligator Gar are both territorial and at least one is outright aggressive — expect serious fighting.
    • Size gap is too large (250 vs 15 cm): Alligator Gar will treat Firemouth Cichlid as food.
    • Your 200 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)
    • Two assertive fish, one genuinely aggressive: Firemouth Cichlid and Clown Knifefish will hold territory and clash.
    • Firemouth Cichlid is bite-sized to a 90 cm predatory clown knifefish — it will be eaten.
    • Your 200 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
  • Fire Eel⛔ Not recommended
    Semi-aggressive · 100 cm · Medium care · 24–28 °C (75–82 °F)
    • Firemouth Cichlid is bite-sized to a 100 cm predatory fire eel — it will be eaten.
    • Firemouth Cichlid and Fire Eel can both be territorial; doable with space and dense planting, but watch for chasing.
    • Your 200 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
  • Koi⛔ Not recommended
    Peaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
    • Firemouth Cichlid is bite-sized to a 90 cm koi — it will be eaten.
    • Your 200 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
  • Redtail Catfish⛔ Not recommended
    Aggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
    • Firemouth Cichlid 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 15 cm Firemouth Cichlid whole.
    • Your 200 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)
    • Firemouth Cichlid 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 15 cm Firemouth Cichlid whole.
    • Your 200 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)
    • Firemouth Cichlid and Wels Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
    • Wels Catfish (300 cm) is big enough to swallow the 15 cm Firemouth Cichlid whole.
    • Your 200 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)
    • Two assertive fish, one genuinely aggressive: Firemouth Cichlid and Wolf Cichlid will hold territory and clash.
    • Size gap is too large (72 vs 15 cm): Wolf Cichlid will treat Firemouth Cichlid as food.
    • Your 200 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 firemouth cichlid 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 firemouth cichlid

Being semi-aggressive, firemouth cichlid 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.

Firemouth Cichlid grows to about 15 cm, so avoid tank mates small enough to be seen as food — as a rule of thumb, skip anything under roughly 8 cm. Match its water, too: aim for 22–29 °C (72–84 °F), pH 6.5–8 and 8–15 dGH. Fish needing very different conditions — coldwater species, or hard-water lovers against a soft-water fish — rarely thrive side by side.

Firemouth Cichlid 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 firemouth cichlid live with other fish?

Yes — with the right companions. Our checker finds 27 compatible freshwater species for firemouth cichlid. 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 firemouth cichlid?

Easy, peaceful, similarly-sized species top the list — for example Corydoras Catfish, Spotfin Corydoras, Peppered Corydoras. Use the checker above to match against your own tank size.

What fish should you avoid keeping with a firemouth cichlid?

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 firemouth cichlid tank mates need?

Start from Firemouth Cichlid'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 Firemouth Cichlid care guide