Altifrons Geophagus Tank Mates

Altifrons Geophagus is semi-aggressive, so its tank mates need choosing with care. Here are the 11 freshwater species that pair well with an altifrons geophagus — plus the 182 to avoid — with a live checker you can tune to your own tank.

The best tank mates for an altifrons geophagus

  • 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 24–28 °C — no size, zone or temperament conflicts.
  • Rubber Lip Pleco ✅ Compatible
    Easy care · Peaceful · 12 cm · 20–26 °C (68–79 °F)
    Compatible on the things that matter: shared water near 24–26 °C, workable temperaments, and no predator-and-prey size gap.
  • Marbled Hoplo ✅ Compatible
    Easy care · Peaceful · 14 cm · 22–28 °C (72–82 °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 Talking Catfish ✅ Compatible
    Easy care · Peaceful · 15 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.
  • Weather Loach ✅ Compatible
    Easy care · Peaceful · 25 cm · 5–24 °C (41–75 °F)
    Compatible on the things that matter: shared water near 24–24 °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)
    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.
  • Banjo Catfish ✅ Compatible
    Medium care · Peaceful · 15 cm · 20–26 °C (68–79 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–26 °C — no size, zone or temperament conflicts.
  • Snowball Pleco ✅ Compatible
    Medium care · Peaceful · 16 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.
  • Yellow-spotted Pleco ✅ Compatible
    Medium care · Peaceful · 35 cm · 24–27 °C (75–81 °F)
    Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
  • Elephant-nose Knifefish ✅ Compatible
    Hard care · Peaceful · 35 cm · 24–29 °C (75–84 °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.

Altifrons Geophagus tank mates that can work with care

  • Adolf's Cory ⚠️ With caution
    Medium care · Peaceful · 5.5 cm · 22–26 °C (72–79 °F)
    Altifrons Geophagus 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)
    pH preferences only just meet (Altifrons Geophagus 5–7.5 vs Afra Cichlid 7.8–8.6) — target the overlap and acclimate slowly.
  • Agassiz's Corydoras ⚠️ With caution
    Easy care · Peaceful · 6 cm · 22–28 °C (72–82 °F)
    Altifrons Geophagus 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.
  • Amano Shrimp ⚠️ With caution
    Easy care · Peaceful · 5 cm · 18–28 °C (64–82 °F)
    Adult Amano Shrimp might survive with Altifrons Geophagus, but expect the young to be eaten — plant heavily.
  • Angelfish ⚠️ With caution
    Medium care · Semi-aggressive · 15 cm · 24–30 °C (75–86 °F)
    Altifrons Geophagus and Angelfish 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)
    Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
  • Assassin Snail ⚠️ With caution
    Easy care · Peaceful · 3 cm · 22–26 °C (72–79 °F)
    Altifrons Geophagus may bully the smaller Assassin Snail, though its armour makes it a hard meal — give it caves and driftwood to retreat into.

+ 139 more “with caution” pairings — see the interactive checker above.

Fish to avoid keeping with an altifrons geophagus

  • Wels Catfish ⛔ Avoid
    Hard care · Aggressive · 300 cm · 15–25 °C (59–77 °F)
    Altifrons Geophagus 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)
    Altifrons Geophagus 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)
    Altifrons Geophagus 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)
    Fire Eel (100 cm) is big enough to swallow the 25 cm Altifrons Geophagus whole.
  • Clown Knifefish ⛔ Avoid
    Hard care · Aggressive · 90 cm · 24–28 °C (75–82 °F)
    Two assertive fish, one genuinely aggressive: Altifrons Geophagus and Clown Knifefish will hold territory and clash.
  • Koi ⛔ Avoid
    Medium care · Peaceful · 90 cm · 4–28 °C (39–82 °F)
    Koi (90 cm) is big enough to swallow the 25 cm Altifrons Geophagus whole.
  • Spotted Gar ⛔ Avoid
    Hard care · Aggressive · 90 cm · 18–26 °C (64–79 °F)
    Altifrons Geophagus 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: Altifrons Geophagus and Wolf Cichlid will hold territory and clash.

+ 174 more to avoid — the checker above flags every one.

Check any fish against an altifrons geophagus

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

Will it live with a Altifrons Geophagus?

We compare each fish against your altifrons geophagus 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, and their water overlaps around 24–26 °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.
    • Keep Altifrons Geophagus 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 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.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Peaceful · 35 cm · Hard care · 24–29 °C (75–84 °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 Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Marbled Hoplo✅ Compatible
    Peaceful · 14 cm · Easy care · 22–28 °C (72–82 °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 Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • 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.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Rubber Lip Pleco✅ Compatible
    Peaceful · 12 cm · Easy care · 20–26 °C (68–79 °F)
    • Compatible on the things that matter: shared water near 24–26 °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.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Snowball Pleco✅ Compatible
    Peaceful · 16 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.
    • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Peaceful · 12 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.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Peaceful · 15 cm · Easy care · 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.
    • Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Weather Loach✅ Compatible
    Peaceful · 25 cm · Easy care · 5–24 °C (41–75 °F)
    • Compatible on the things that matter: shared water near 24–24 °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 Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Yellow-spotted Pleco✅ Compatible
    Peaceful · 35 cm · Medium care · 24–27 °C (75–81 °F)
    • Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–27 °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 Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Angelicus Synodontis⚠️ With caution
    Semi-aggressive · 25 cm · Medium care · 23–27 °C (73–81 °F)
    • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Black Collared Catfish⚠️ With caution
    Semi-aggressive · 27 cm · Hard care · 23–25 °C (73–77 °F)
    • Altifrons Geophagus and Black Collared Catfish can both be territorial; doable with space and dense planting, but watch for chasing.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Clown Loach⚠️ With caution
    Peaceful · 30 cm · Medium care · 25–30 °C (77–86 °F)
    • Your 378 L tank is below the ~400 L this pairing really wants — crowding raises aggression.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Galaxy Pleco⚠️ With caution
    Semi-aggressive · 25 cm · Medium care · 22–26 °C (72–79 °F)
    • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Gold Nugget Pleco⚠️ With caution
    Semi-aggressive · 28 cm · Hard care · 24–29 °C (75–84 °F)
    • Altifrons Geophagus and Gold Nugget Pleco can both be territorial; doable with space and dense planting, but watch for chasing.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Honeycomb Pleco⚠️ With caution
    Semi-aggressive · 21 cm · Medium care · 24–29 °C (75–84 °F)
    • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Kissing Gourami⚠️ With caution
    Semi-aggressive · 30 cm · Medium care · 22–28 °C (72–82 °F)
    • Altifrons Geophagus and Kissing Gourami can both be territorial; doable with space and dense planting, but watch for chasing.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Leopard Cactus Pleco⚠️ With caution
    Semi-aggressive · 30 cm · Hard care · 24–30 °C (75–86 °F)
    • Altifrons Geophagus and Leopard Cactus Pleco can both be territorial; doable with space and dense planting, but watch for chasing.
    • Your 378 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Mango Pleco⚠️ With caution
    Semi-aggressive · 28 cm · Hard care · 25–32 °C (77–90 °F)
    • Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Peacock Eel⚠️ With caution
    Semi-aggressive · 30 cm · Medium care · 22–28 °C (72–82 °F)
    • Altifrons Geophagus and Peacock Eel can both be territorial; doable with space and dense planting, but watch for chasing.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Pearl Cichlid⚠️ With caution
    Semi-aggressive · 28 cm · Medium care · 22–28 °C (72–82 °F)
    • Altifrons Geophagus and Pearl Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Severum⚠️ With caution
    Semi-aggressive · 25 cm · Medium 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.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Silver Cichlid⚠️ With caution
    Semi-aggressive · 30 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.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Spotted Pleco⚠️ With caution
    Semi-aggressive · 30 cm · Easy care · 18–26 °C (64–79 °F)
    • Altifrons Geophagus and Spotted Pleco can both be territorial; doable with space and dense planting, but watch for chasing.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Spotted Severum⚠️ With caution
    Semi-aggressive · 25 cm · Medium care · 26–30 °C (79–86 °F)
    • Altifrons Geophagus and Spotted Severum can both be territorial; doable with space and dense planting, but watch for chasing.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Sunshine Pleco⚠️ With caution
    Semi-aggressive · 30 cm · Hard care · 23–29 °C (73–84 °F)
    • Altifrons Geophagus and Sunshine Pleco can both be territorial; doable with space and dense planting, but watch for chasing.
    • Your 378 L tank is below the ~473 L this pairing really wants — crowding raises aggression.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Alligator Gar⛔ Not recommended
    Aggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
    • Altifrons Geophagus and Alligator Gar are both territorial and at least one is outright aggressive — expect serious fighting.
    • Size gap is too large (250 vs 25 cm): Alligator Gar will treat Altifrons Geophagus as food.
    • Your 378 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
    • Keep Altifrons Geophagus in a shoal of 6+ 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: Altifrons Geophagus and Clown Knifefish will hold territory and clash.
    • Size gap is too large (90 vs 25 cm): Clown Knifefish will treat Altifrons Geophagus as food.
    • Your 378 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • 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 25 cm Altifrons Geophagus whole.
    • Altifrons Geophagus and Fire Eel can both be territorial; doable with space and dense planting, but watch for chasing.
    • Your 378 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Koi⛔ Not recommended
    Peaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
    • Koi (90 cm) is big enough to swallow the 25 cm Altifrons Geophagus whole.
    • One likes softer water and the other harder (1–8 vs 9–18 dGH) — a compromise, not a perfect match.
    • Your 378 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Redtail Catfish⛔ Not recommended
    Aggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
    • Altifrons Geophagus and Redtail Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
    • Altifrons Geophagus is bite-sized to a 120 cm predatory redtail catfish — it will be eaten.
    • Your 378 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Spotted Gar⛔ Not recommended
    Aggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
    • Altifrons Geophagus and Spotted Gar are both territorial and at least one is outright aggressive — expect serious fighting.
    • Size gap is too large (90 vs 25 cm): Spotted Gar will treat Altifrons Geophagus as food.
    • Your 378 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Wels Catfish⛔ Not recommended
    Aggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
    • Altifrons Geophagus and Wels Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
    • Size gap is too large (300 vs 25 cm): Wels Catfish will treat Altifrons Geophagus as food.
    • Your 378 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
    • Keep Altifrons Geophagus in a shoal of 6+ or it gets stressed and nippy.
  • Wolf Cichlid⛔ Not recommended
    Aggressive · 72 cm · Hard care · 24–30 °C (75–86 °F)
    • Two assertive fish, one genuinely aggressive: Altifrons Geophagus and Wolf Cichlid will hold territory and clash.
    • Altifrons Geophagus is bite-sized to a 72 cm predatory wolf cichlid — it will be eaten.
    • Your 378 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
    • Keep Altifrons Geophagus in a shoal of 6+ 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 an altifrons geophagus community tank

Give the group a stable, planted 378 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 the right tank mates for an altifrons geophagus

Being semi-aggressive, altifrons geophagus 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.

Altifrons Geophagus grows to about 25 cm, so avoid tank mates small enough to be seen as food — as a rule of thumb, skip anything under roughly 13 cm. Match its water, too: aim for 24–28 °C (75–82 °F), pH 5–7.5 and 1–8 dGH. Fish needing very different conditions — coldwater species, or hard-water lovers against a soft-water fish — rarely thrive side by side.

Altifrons Geophagus is a shoaling fish — stock a group of 6+ 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.

Frequently asked questions

Can an altifrons geophagus live with other fish?

Yes — with the right companions. Our checker finds 11 compatible freshwater species for altifrons geophagus. 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 an altifrons geophagus?

Easy, peaceful, similarly-sized species top the list — for example Bristlenose Pleco, Rubber Lip Pleco, Marbled Hoplo. Use the checker above to match against your own tank size.

What fish should you avoid keeping with an altifrons geophagus?

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 altifrons geophagus tank mates need?

Start from Altifrons Geophagus's own minimum and scale up with every addition. The checker above defaults to a 378 L community tank and flags pairings that need more room — drag the slider to match your setup.