Keyhole Cichlid Tank Mates

Keyhole Cichlid is peaceful, so its tank mates need choosing with care. Here are the 170 freshwater species that pair well with a keyhole cichlid — plus the 53 to avoid — with a live checker you can tune to your own tank.

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

The best tank mates for a keyhole cichlid

  • Ember Tetra ✅ Compatible
    Easy care · Peaceful · 2 cm · 24–28 °C (75–82 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Neon Green Rasbora ✅ Compatible
    Easy care · Peaceful · 2 cm · 22–26 °C (72–79 °F)
    Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
  • Ramshorn Snail ✅ Compatible
    Easy care · Peaceful · 2 cm · 20–28 °C (68–82 °F)
    Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Red Lip Nerite Snail ✅ Compatible
    Easy care · Peaceful · 2 cm · 22–28 °C (72–82 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Dawn Tetra ✅ Compatible
    Easy care · Peaceful · 2.5 cm · 22–28 °C (72–82 °F)
    Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Nerite Snail ✅ Compatible
    Easy care · Peaceful · 2.5 cm · 22–28 °C (72–82 °F)
    Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
  • Assassin Snail ✅ Compatible
    Easy care · Peaceful · 3 cm · 22–26 °C (72–79 °F)
    Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
  • Endler's Livebearer ✅ Compatible
    Easy care · Peaceful · 3 cm · 22–28 °C (72–82 °F)
    Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
  • Glowlight Danio ✅ Compatible
    Easy care · Peaceful · 3 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.
  • Gold Ring Danio ✅ Compatible
    Easy care · Peaceful · 3 cm · 18–26 °C (64–79 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Malaysian Trumpet Snail ✅ Compatible
    Easy care · Peaceful · 3 cm · 21–27 °C (70–81 °F)
    Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
  • Neon Tetra ✅ Compatible
    Easy care · Peaceful · 3 cm · 20–26 °C (68–79 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Tail-spot Corydoras ✅ Compatible
    Easy care · Peaceful · 3 cm · 22–28 °C (72–82 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Trinidad Guppy ✅ Compatible
    Easy care · Peaceful · 3 cm · 19–24 °C (66–75 °F)
    Both are peaceful, and their water overlaps around 22–24 °C — no size, zone or temperament conflicts.
  • Pygmy Corydoras ✅ Compatible
    Easy care · Peaceful · 3.2 cm · 22–26 °C (72–79 °F)
    Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
  • Glowlight Rasbora ✅ Compatible
    Easy care · Peaceful · 3.5 cm · 23–28 °C (73–82 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Blue Danio ✅ Compatible
    Easy care · Peaceful · 4 cm · 21–26 °C (70–79 °F)
    Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
  • Emperor Tetra ✅ Compatible
    Easy care · Peaceful · 4 cm · 23–27 °C (73–81 °F)
    Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
  • Flame Tetra ✅ Compatible
    Easy care · Peaceful · 4 cm · 22–28 °C (72–82 °F)
    Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Glowlight Tetra ✅ Compatible
    Easy care · Peaceful · 4 cm · 22–28 °C (72–82 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Golden Dwarf Barb ✅ Compatible
    Easy care · Peaceful · 4 cm · 18–24 °C (64–75 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Phoenix Tetra ✅ Compatible
    Easy care · Peaceful · 4 cm · 23–28 °C (73–82 °F)
    Both are peaceful, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
  • Red Phantom Tetra ✅ Compatible
    Easy care · Peaceful · 4 cm · 22–28 °C (72–82 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Rosy Tetra ✅ Compatible
    Easy care · Peaceful · 4 cm · 22–28 °C (72–82 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
With caution

Keyhole Cichlid tank mates that can work with care

  • Afra Cichlid ⚠️ With caution
    Medium care · Semi-aggressive · 10 cm · 24–28 °C (75–82 °F)
    pH preferences only just meet (Keyhole Cichlid 6–7.5 vs Afra Cichlid 7.8–8.6) — target the overlap and acclimate slowly.
  • Altifrons Geophagus ⚠️ With caution
    Medium care · Semi-aggressive · 25 cm · 24–28 °C (75–82 °F)
    Expect Altifrons Geophagus to harass Keyhole Cichlid at times; give dense cover and watch them at feeding.
  • Amano Shrimp ⚠️ With caution
    Easy care · Peaceful · 5 cm · 18–28 °C (64–82 °F)
    Adult Amano Shrimp might survive with Keyhole Cichlid, but expect the young to be eaten — plant heavily.
  • Amazon Puffer ⚠️ With caution
    Medium care · Peaceful · 8 cm · 23–28 °C (73–82 °F)
    Your 80 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
  • Angelfish ⚠️ With caution
    Medium care · Semi-aggressive · 15 cm · 24–30 °C (75–86 °F)
    Expect Angelfish to harass Keyhole Cichlid at times; give dense cover and watch them at feeding.
  • Angelicus Synodontis ⚠️ With caution
    Medium care · Semi-aggressive · 25 cm · 23–27 °C (73–81 °F)
    Expect Angelicus Synodontis to harass Keyhole Cichlid at times; give dense cover and watch them at feeding.
  • Arrowhead Puffer ⚠️ With caution
    Hard care · Aggressive · 12 cm · 23–28 °C (73–82 °F)
    Arrowhead Puffer is aggressive and may chase or nip the smaller Keyhole Cichlid — plant heavily and break up sight lines.
  • Auratus Cichlid ⚠️ With caution
    Medium care · Aggressive · 11 cm · 23–28 °C (73–82 °F)
    Different pH ranges (6–7.5 vs 7.6–8.8); doable if you sit in the shared band, but not ideal long-term.

+ 109 more “with caution” pairings — see the interactive checker above.

Avoid

Fish to avoid keeping with a keyhole cichlid

  • Wels Catfish ⛔ Avoid
    Hard care · Aggressive · 300 cm · 15–25 °C (59–77 °F)
    Wels Catfish (300 cm) is big enough to swallow the 10 cm Keyhole Cichlid whole.
  • Alligator Gar ⛔ Avoid
    Hard care · Aggressive · 250 cm · 24–28 °C (75–82 °F)
    Alligator Gar (250 cm) is big enough to swallow the 10 cm Keyhole Cichlid whole.
  • Redtail Catfish ⛔ Avoid
    Hard care · Aggressive · 120 cm · 24–27 °C (75–81 °F)
    Keyhole Cichlid is bite-sized to a 120 cm predatory redtail catfish — it will be eaten.
  • Fire Eel ⛔ Avoid
    Medium care · Semi-aggressive · 100 cm · 24–28 °C (75–82 °F)
    Fire Eel (100 cm) is big enough to swallow the 10 cm Keyhole Cichlid whole.
  • Clown Knifefish ⛔ Avoid
    Hard care · Aggressive · 90 cm · 24–28 °C (75–82 °F)
    Keyhole Cichlid is bite-sized to a 90 cm predatory clown knifefish — it will be eaten.
  • Koi ⛔ Avoid
    Medium care · Peaceful · 90 cm · 4–28 °C (39–82 °F)
    Keyhole 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)
    Size gap is too large (90 vs 10 cm): Spotted Gar will treat Keyhole Cichlid as food.
  • Wolf Cichlid ⛔ Avoid
    Hard care · Aggressive · 72 cm · 24–30 °C (75–86 °F)
    Size gap is too large (72 vs 10 cm): Wolf Cichlid will treat Keyhole Cichlid as food.

+ 45 more to avoid — the checker above flags every one.

Interactive tool

Check any fish against a keyhole cichlid

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

Tank-mate checker

Will it live with a Keyhole Cichlid?

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

  • African Butterfly Cichlid✅ Compatible
    Semi-aggressive · 8 cm · Medium care · 22–28 °C (72–82 °F)
    • Peaceful + Semi-aggressive, 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 middle of the tank — offer enough cover so they aren't always in each other's space.
  • Agassiz's Dwarf Cichlid✅ Compatible
    Semi-aggressive · 9 cm · Medium 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.
  • Badis✅ Compatible
    Semi-aggressive · 8 cm · Medium care · 22–28 °C (72–82 °F)
    • Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Bearded Corydoras✅ Compatible
    Peaceful · 10 cm · Medium care · 18–24 °C (64–75 °F)
    • Both are peaceful, and their water overlaps around 22–24 °C — no size, zone or temperament conflicts.
    • 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)
    • Both are peaceful, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
  • Bolivian Ram✅ Compatible
    Peaceful · 8 cm · Medium care · 24–28 °C (75–82 °F)
    • Both are peaceful, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
  • Brilliant Rasbora✅ Compatible
    Peaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
    • Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
    • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
    • Keep Brilliant Rasbora 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)
    • Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
  • Clown Pleco✅ Compatible
    Peaceful · 9 cm · Medium care · 24–28 °C (75–82 °F)
    • Both are peaceful, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
  • Cockatoo Dwarf Cichlid✅ Compatible
    Semi-aggressive · 8 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.
  • Dwarf Gourami✅ Compatible
    Semi-aggressive · 8 cm · Medium care · 24–28 °C (75–82 °F)
    • Peaceful + Semi-aggressive, 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 middle of the tank — offer enough cover so they aren't always in each other's space.
  • Giant Betta✅ Compatible
    Peaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
    • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
    • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Giant Kuhli Loach✅ Compatible
    Peaceful · 12 cm · Easy care · 24–30 °C (75–86 °F)
    • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Glass Catfish✅ Compatible
    Peaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
    • Both are peaceful, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
    • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
    • Keep Glass Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Goldeneye Dwarf Cichlid✅ Compatible
    Semi-aggressive · 8 cm · Easy care · 24–28 °C (75–82 °F)
    • Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
  • Kuhli Loach✅ Compatible
    Peaceful · 10 cm · Easy care · 24–30 °C (75–86 °F)
    • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • 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.
  • Molly✅ Compatible
    Peaceful · 10 cm · Easy care · 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.
    • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
  • Murray River Rainbowfish✅ Compatible
    Peaceful · 11 cm · Easy care · 15–26 °C (59–79 °F)
    • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
    • Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
    • Keep Murray River Rainbowfish 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)
    • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Splashing Tetra✅ Compatible
    Peaceful · 8 cm · Medium care · 22–28 °C (72–82 °F)
    • Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
    • Keep Splashing Tetra 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)
    • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Thick-lipped Gourami✅ Compatible
    Peaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
    • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
    • Both favour the middle 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)
    • Compatible on the things that matter: shared water near 26–28 °C, workable temperaments, and no predator-and-prey size gap.
  • Afra Cichlid⚠️ With caution
    Semi-aggressive · 10 cm · Medium care · 24–28 °C (75–82 °F)
    • pH preferences only just meet (Keyhole Cichlid 6–7.5 vs Afra Cichlid 7.8–8.6) — target the overlap and acclimate slowly.
    • Expect Afra Cichlid to harass Keyhole Cichlid at times; give dense cover and watch them at feeding.
    • Your 80 L tank is below the ~150 L this pairing really wants — crowding raises aggression.
    • Keep Afra Cichlid in a shoal of 6+ or it gets stressed and nippy.
  • Auratus Cichlid⚠️ With caution
    Aggressive · 11 cm · Medium care · 23–28 °C (73–82 °F)
    • Different pH ranges (6–7.5 vs 7.6–8.8); doable if you sit in the shared band, but not ideal long-term.
    • Expect Auratus Cichlid to harass Keyhole Cichlid at times; give dense cover and watch them at feeding.
    • Your 80 L tank is below the ~190 L this pairing really wants — crowding raises aggression.
    • Keep Auratus Cichlid 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)
    • Your 80 L tank is below the ~110 L this pairing really wants — crowding raises aggression.
    • Keep Clown Rasbora in a shoal of 6+ or it gets stressed and nippy.
  • Convict Cichlid⚠️ With caution
    Aggressive · 10 cm · Easy care · 21–28 °C (70–82 °F)
    • Convict Cichlid and Keyhole Cichlid are close in size, but the aggressive one tends to dominate — add keyhole cichlid in a group to spread the pressure.
    • Your 80 L tank is below the ~110 L this pairing really wants — crowding raises aggression.
  • Daffodil Cichlid⚠️ With caution
    Semi-aggressive · 10 cm · Medium care · 23–27 °C (73–81 °F)
    • Different pH ranges (6–7.5 vs 7.8–9); doable if you sit in the shared band, but not ideal long-term.
    • Daffodil Cichlid and Keyhole Cichlid are close in size, but the semi-aggressive one tends to dominate — add keyhole cichlid in a group to spread the pressure.
    • Your 80 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
  • Electric Yellow Cichlid⚠️ With caution
    Semi-aggressive · 10 cm · Medium care · 23–26 °C (73–79 °F)
    • pH preferences only just meet (Keyhole Cichlid 6–7.5 vs Electric Yellow Cichlid 7.8–8.9) — target the overlap and acclimate slowly.
    • Electric Yellow Cichlid is semi-aggressive and may chase or nip the smaller Keyhole Cichlid — plant heavily and break up sight lines.
    • Your 80 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
  • Giant Danio⚠️ With caution
    Peaceful · 10 cm · Easy care · 20–27 °C (68–81 °F)
    • Your 80 L tank is below the ~110 L this pairing really wants — crowding raises aggression.
    • 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)
    • Golden Wonder Killifish and Keyhole Cichlid are close in size, but the semi-aggressive one tends to dominate — add keyhole cichlid in a group to spread the pressure.
  • Johanni Cichlid⚠️ With caution
    Aggressive · 10 cm · Medium care · 24–28 °C (75–82 °F)
    • Different pH ranges (6–7.5 vs 7.8–8.6); doable if you sit in the shared band, but not ideal long-term.
    • Expect Johanni Cichlid to harass Keyhole Cichlid at times; give dense cover and watch them at feeding.
    • Your 80 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
    • Keep Johanni Cichlid 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)
    • Expect Kribensis to harass Keyhole Cichlid at times; give dense cover and watch them at feeding.
  • Paradise Fish⚠️ With caution
    Aggressive · 10 cm · Medium care · 16–26 °C (61–79 °F)
    • Expect Paradise Fish to harass Keyhole Cichlid at times; give dense cover and watch them at feeding.
  • Rosy Barb⚠️ With caution
    Semi-aggressive · 10 cm · Easy care · 18–26 °C (64–79 °F)
    • Rosy Barb and Keyhole Cichlid are close in size, but the semi-aggressive one tends to dominate — add keyhole cichlid in a group to spread the pressure.
    • Keep Rosy Barb in a shoal of 6+ or it gets stressed and nippy.
  • Rusty Cichlid⚠️ With caution
    Semi-aggressive · 10 cm · Medium care · 24–28 °C (75–82 °F)
    • Different pH ranges (6–7.5 vs 7.8–8.5); doable if you sit in the shared band, but not ideal long-term.
    • Rusty Cichlid is semi-aggressive and may chase or nip the smaller Keyhole Cichlid — plant heavily and break up sight lines.
    • Your 80 L tank is below the ~150 L this pairing really wants — crowding raises aggression.
  • Tanganyikan Butterfly Cichlid⚠️ With caution
    Semi-aggressive · 10 cm · Hard care · 24–28 °C (75–82 °F)
    • Different pH ranges (6–7.5 vs 8–9); doable if you sit in the shared band, but not ideal long-term.
    • Expect Tanganyikan Butterfly Cichlid to harass Keyhole Cichlid at times; give dense cover and watch them at feeding.
    • Your 80 L tank is below the ~130 L this pairing really wants — crowding raises aggression.
  • Topaz Cichlid⚠️ With caution
    Semi-aggressive · 10 cm · Medium care · 23–28 °C (73–82 °F)
    • Topaz Cichlid and Keyhole Cichlid are close in size, but the semi-aggressive one tends to dominate — add keyhole cichlid in a group to spread the pressure.
  • Upside-down Catfish⚠️ With caution
    Peaceful · 10 cm · Easy care · 22–26 °C (72–79 °F)
    • Your 80 L tank is below the ~115 L this pairing really wants — crowding raises aggression.
  • Alligator Gar⛔ Not recommended
    Aggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
    • Alligator Gar (250 cm) is big enough to swallow the 10 cm Keyhole Cichlid whole.
    • Alligator Gar is aggressive and may chase or nip the smaller Keyhole Cichlid — plant heavily and break up sight lines.
    • Your 80 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)
    • Keyhole Cichlid is bite-sized to a 90 cm predatory clown knifefish — it will be eaten.
    • Expect Clown Knifefish to harass Keyhole Cichlid at times; give dense cover and watch them at feeding.
    • Your 80 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)
    • Fire Eel (100 cm) is big enough to swallow the 10 cm Keyhole Cichlid whole.
    • Expect Fire Eel to harass Keyhole Cichlid at times; give dense cover and watch them at feeding.
    • Your 80 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)
    • Keyhole Cichlid is bite-sized to a 90 cm koi — it will be eaten.
    • Your 80 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)
    • Keyhole Cichlid is bite-sized to a 120 cm predatory redtail catfish — it will be eaten.
    • Redtail Catfish is aggressive and may chase or nip the smaller Keyhole Cichlid — plant heavily and break up sight lines.
    • Your 80 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)
    • Size gap is too large (90 vs 10 cm): Spotted Gar will treat Keyhole Cichlid as food.
    • Spotted Gar is aggressive and may chase or nip the smaller Keyhole Cichlid — plant heavily and break up sight lines.
    • Your 80 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)
    • Wels Catfish (300 cm) is big enough to swallow the 10 cm Keyhole Cichlid whole.
    • Wels Catfish is aggressive and may chase or nip the smaller Keyhole Cichlid — plant heavily and break up sight lines.
    • Your 80 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)
    • Size gap is too large (72 vs 10 cm): Wolf Cichlid will treat Keyhole Cichlid as food.
    • Wolf Cichlid is aggressive and may chase or nip the smaller Keyhole Cichlid — plant heavily and break up sight lines.
    • Your 80 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 keyhole cichlid community tank

Give the group a stable, planted 80 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 keyhole cichlid

As a peaceful species, keyhole cichlid is easily bullied — favour other calm, non-nippy fish and steer clear of boisterous or aggressive tank mates. It mostly occupies the middle of the tank, so it pairs naturally with species that use the other levels.

Keyhole Cichlid grows to about 10 cm, so avoid tank mates small enough to be seen as food — as a rule of thumb, skip anything under roughly 5 cm. Match its water, too: aim for 22–28 °C (72–82 °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.

Keyhole Cichlid is a shoaling fish — stock a group of 2+ 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 keyhole cichlid live with other fish?

Yes — with the right companions. Our checker finds 170 compatible freshwater species for keyhole 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 keyhole cichlid?

Easy, peaceful, similarly-sized species top the list — for example Ember Tetra, Neon Green Rasbora, Ramshorn Snail. Use the checker above to match against your own tank size.

What fish should you avoid keeping with a keyhole 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 keyhole cichlid tank mates need?

Start from Keyhole Cichlid's own minimum and scale up with every addition. The checker above defaults to a 80 L community tank and flags pairings that need more room — drag the slider to match your setup.

← Back to the full Keyhole Cichlid care guide