Alligator Gar Tank Mates
Alligator Gar is aggressive and a demanding tank mate. Here's what can (and mostly can't) share its tank — and why.
The best tank mates for an alligator gar
Honestly, very few. Alligator Gar is best kept on its own, or only with exceptionally robust, similarly-tempered fish in a large tank. Use the checker above and the "avoid" list below to see why typical community fish don't work.
Alligator Gar tank mates that can work with care
- Adolf's Cory ⚠️ With cautionMedium care · Peaceful · 5.5 cm · 22–26 °C (72–79 °F)Alligator Gar 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 cautionEasy care · Peaceful · 6 cm · 22–28 °C (72–82 °F)Alligator Gar may bully the smaller Agassiz's Corydoras, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Assassin Snail ⚠️ With cautionEasy care · Peaceful · 3 cm · 22–26 °C (72–79 °F)Alligator Gar 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 cautionEasy care · Peaceful · 5 cm · 23–28 °C (73–82 °F)Alligator Gar 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 cautionEasy care · Peaceful · 5 cm · 22–27 °C (72–81 °F)Alligator Gar 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 cautionMedium care · Peaceful · 10 cm · 18–24 °C (64–75 °F)Alligator Gar may bully the smaller Bearded Corydoras, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Black Doras Catfish ⚠️ With cautionHard care · Peaceful · 60 cm · 22–28 °C (72–82 °F)Alligator Gar may bully the smaller Black Doras Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Blood Red Tiger Pleco ⚠️ With cautionMedium care · Peaceful · 6 cm · 24–29 °C (75–84 °F)Alligator Gar may bully the smaller Blood Red Tiger Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
+ 47 more “with caution” pairings — see the interactive checker above.
Fish to avoid keeping with an alligator gar
- Mekong Giant Catfish ⛔ AvoidHard care · Semi-aggressive · 300 cm · 20–28 °C (68–82 °F)Alligator Gar and Mekong Giant Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
- Wels Catfish ⛔ AvoidHard care · Aggressive · 300 cm · 15–25 °C (59–77 °F)Alligator Gar and Wels Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
- Redtail Catfish ⛔ AvoidHard care · Aggressive · 120 cm · 24–27 °C (75–81 °F)Alligator Gar and Redtail Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
- Fire Eel ⛔ AvoidMedium care · Semi-aggressive · 100 cm · 24–28 °C (75–82 °F)Two assertive fish, one genuinely aggressive: Alligator Gar and Fire Eel will hold territory and clash.
- Clown Knifefish ⛔ AvoidHard care · Aggressive · 90 cm · 24–28 °C (75–82 °F)Two assertive fish, one genuinely aggressive: Alligator Gar and Clown Knifefish will hold territory and clash.
- Koi ⛔ AvoidMedium care · Peaceful · 90 cm · 4–28 °C (39–82 °F)Koi is bite-sized to a 250 cm predatory alligator gar — it will be eaten.
- Spotted Gar ⛔ AvoidHard care · Aggressive · 90 cm · 18–26 °C (64–79 °F)Alligator Gar and Spotted Gar are both territorial and at least one is outright aggressive — expect serious fighting.
- Wolf Cichlid ⛔ AvoidHard care · Aggressive · 72 cm · 24–30 °C (75–86 °F)Two assertive fish, one genuinely aggressive: Alligator Gar and Wolf Cichlid will hold territory and clash.
+ 277 more to avoid — the checker above flags every one.
Check any fish against an alligator gar
Dial in your exact tank size and filter by result — the checker scores every species in our database against an alligator gar, with the reasoning for each verdict.
Will it live with a Alligator Gar?
We compare each fish against your alligator gar on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Bearded Corydoras⚠️ With cautionPeaceful · 10 cm · Medium care · 18–24 °C (64–75 °F)
- Alligator Gar may bully the smaller Bearded Corydoras, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Keep Bearded Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Black Doras Catfish⚠️ With cautionPeaceful · 60 cm · Hard care · 22–28 °C (72–82 °F)
- Alligator Gar may bully the smaller Black Doras Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Bristlenose Pleco⚠️ With cautionPeaceful · 12 cm · Easy care · 23–30 °C (73–86 °F)
- Alligator Gar may bully the smaller Bristlenose Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Common Pleco⚠️ With cautionPeaceful · 45 cm · Medium care · 22–28 °C (72–82 °F)
- Alligator Gar may bully the smaller Common Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Giant Glass Catfish⚠️ With cautionPeaceful · 15 cm · Medium care · 22–27 °C (72–81 °F)
- Expect Alligator Gar to harass Giant Glass Catfish at times; give dense cover and watch them at feeding.
- Alligator Gar may bully the smaller Giant Glass Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Marbled Hoplo⚠️ With cautionPeaceful · 14 cm · Easy care · 22–28 °C (72–82 °F)
- Alligator Gar may bully the smaller Marbled Hoplo, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Medusa Pleco⚠️ With cautionPeaceful · 12 cm · Medium care · 26–30 °C (79–86 °F)
- Alligator Gar may bully the smaller Medusa Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Porthole Catfish⚠️ With cautionPeaceful · 10 cm · Easy care · 22–28 °C (72–82 °F)
- Alligator Gar may bully the smaller Porthole Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Rubber Lip Pleco⚠️ With cautionPeaceful · 12 cm · Easy care · 20–26 °C (68–79 °F)
- Alligator Gar may bully the smaller Rubber Lip Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Sailfin Pleco⚠️ With cautionPeaceful · 50 cm · Medium care · 22–28 °C (72–82 °F)
- Alligator Gar may bully the smaller Sailfin Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Snowball Pleco⚠️ With cautionPeaceful · 16 cm · Medium care · 24–30 °C (75–86 °F)
- Alligator Gar may bully the smaller Snowball Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Spotted Rubbernose Pleco⚠️ With cautionPeaceful · 12 cm · Medium care · 20–26 °C (68–79 °F)
- Alligator Gar may bully the smaller Spotted Rubbernose Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Spotted Talking Catfish⚠️ With cautionPeaceful · 15 cm · Easy care · 22–26 °C (72–79 °F)
- Alligator Gar may bully the smaller Spotted Talking Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Upside-down Catfish⚠️ With cautionPeaceful · 10 cm · Easy care · 22–26 °C (72–79 °F)
- Alligator Gar may bully the smaller Upside-down Catfish, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Yellow-spotted Pleco⚠️ With cautionPeaceful · 35 cm · Medium care · 24–27 °C (75–81 °F)
- Alligator Gar may bully the smaller Yellow-spotted Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Zebra Pleco⚠️ With cautionPeaceful · 10 cm · Hard care · 26–30 °C (79–86 °F)
- Alligator Gar may bully the smaller Zebra Pleco, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Clown Knifefish⛔ Not recommendedAggressive · 90 cm · Hard care · 24–28 °C (75–82 °F)
- Two assertive fish, one genuinely aggressive: Alligator Gar and Clown Knifefish will hold territory and clash.
- Size gap is too large (250 vs 90 cm): Alligator Gar will treat Clown Knifefish as food.
- Fire Eel⛔ Not recommendedSemi-aggressive · 100 cm · Medium care · 24–28 °C (75–82 °F)
- Two assertive fish, one genuinely aggressive: Alligator Gar and Fire Eel will hold territory and clash.
- Alligator Gar (250 cm) is big enough to swallow the 100 cm Fire Eel whole.
- Koi⛔ Not recommendedPeaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
- Koi is bite-sized to a 250 cm predatory alligator gar — it will be eaten.
- Alligator Gar is aggressive and may chase or nip the smaller Koi — plant heavily and break up sight lines.
- Your 3785 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
- Mekong Giant Catfish⛔ Not recommendedSemi-aggressive · 300 cm · Hard care · 20–28 °C (68–82 °F)
- Alligator Gar and Mekong Giant Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
- Your 3785 L tank is below the ~100000 L this pairing really wants — crowding raises aggression.
- Redtail Catfish⛔ Not recommendedAggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
- Alligator Gar and Redtail Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
- Your 3785 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
- Spotted Gar⛔ Not recommendedAggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
- Alligator Gar and Spotted Gar are both territorial and at least one is outright aggressive — expect serious fighting.
- Spotted Gar is bite-sized to a 250 cm predatory alligator gar — it will be eaten.
- Wels Catfish⛔ Not recommendedAggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
- Alligator Gar and Wels Catfish are both territorial and at least one is outright aggressive — expect serious fighting.
- Your 3785 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
- Wolf Cichlid⛔ Not recommendedAggressive · 72 cm · Hard care · 24–30 °C (75–86 °F)
- Two assertive fish, one genuinely aggressive: Alligator Gar and Wolf Cichlid will hold territory and clash.
- Alligator Gar (250 cm) is big enough to swallow the 72 cm Wolf Cichlid whole.
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 alligator gar community tank
Give the group a stable, planted 3785 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 alligator gar
Alligator Gar is aggressive and territorial, so most community fish are unsafe; any tank mate must be large, tough and able to hold its own. It mostly occupies the top of the tank, so it pairs naturally with species that use the other levels.
Alligator Gar grows to about 250 cm, so avoid tank mates small enough to be seen as food — as a rule of thumb, skip anything under roughly 125 cm. Match its water, too: aim for 24–28 °C (75–82 °F), pH 6.8–7.8 and 4–15 dGH. Fish needing very different conditions — coldwater species, or hard-water lovers against a soft-water fish — rarely thrive side by side.
Alligator Gar 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.
Frequently asked questions
Can an alligator gar live with other fish?
Barely. Alligator Gar is best kept on its own or only with exceptionally robust, similarly-tempered fish in a large tank — see why below.
What is the best tank mate for an alligator gar?
There isn't a safe community match — alligator gar needs robust, species-appropriate housing rather than typical community tank mates.
What fish should you avoid keeping with an alligator gar?
Avoid Mekong Giant Catfish, Wels Catfish, 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 alligator gar tank mates need?
Start from Alligator Gar's own minimum and scale up with every addition. The checker above defaults to a 3785 L community tank and flags pairings that need more room — drag the slider to match your setup.