Tailspotted Oto Tank Mates

Tailspotted Oto is peaceful, so its tank mates need choosing with care. Here are the 167 freshwater species that pair well with a tailspotted oto — plus the 1 to avoid — with a live checker you can tune to your own tank.

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

The best tank mates for a tailspotted oto

  • Ember Tetra ✅ Compatible
    Easy care · Peaceful · 2 cm · 24–28 °C (75–82 °F)
    Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
  • 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)
    Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
  • Red Lip Nerite Snail ✅ Compatible
    Easy care · Peaceful · 2 cm · 22–28 °C (72–82 °F)
    Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
  • Dawn Tetra ✅ Compatible
    Easy care · Peaceful · 2.5 cm · 22–28 °C (72–82 °F)
    Compatible on the things that matter: shared water near 22–27 °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)
    Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
  • 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.
  • Cherry Shrimp ✅ Compatible
    Easy care · Peaceful · 3 cm · 18–28 °C (64–82 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • Endler's Livebearer ✅ Compatible
    Easy care · Peaceful · 3 cm · 22–28 °C (72–82 °F)
    Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
  • Glowlight Danio ✅ Compatible
    Easy care · Peaceful · 3 cm · 22–26 °C (72–79 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • 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, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
  • Tail-spot Corydoras ✅ Compatible
    Easy care · Peaceful · 3 cm · 22–28 °C (72–82 °F)
    Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
  • Trinidad Guppy ✅ Compatible
    Easy care · Peaceful · 3 cm · 19–24 °C (66–75 °F)
    Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
  • 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)
    Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
  • Ghost Shrimp ✅ Compatible
    Easy care · Peaceful · 4 cm · 18–28 °C (64–82 °F)
    Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
  • Glowlight Tetra ✅ Compatible
    Easy care · Peaceful · 4 cm · 22–28 °C (72–82 °F)
    Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
  • Golden Dwarf Barb ✅ Compatible
    Easy care · Peaceful · 4 cm · 18–24 °C (64–75 °F)
    Both are peaceful, and their water overlaps around 22–24 °C — no size, zone or temperament conflicts.
  • Phoenix Tetra ✅ Compatible
    Easy care · Peaceful · 4 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.
With caution

Tailspotted Oto 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 (Tailspotted Oto 6–7.5 vs Afra Cichlid 7.8–8.6) — target the overlap and acclimate slowly.
  • African Butterfly Cichlid ⚠️ With caution
    Medium care · Semi-aggressive · 8 cm · 22–28 °C (72–82 °F)
    Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
  • Agassiz's Dwarf Cichlid ⚠️ With caution
    Medium care · Semi-aggressive · 9 cm · 24–30 °C (75–86 °F)
    Agassiz's Dwarf Cichlid may bully the smaller Tailspotted Oto, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Alligator Gar ⚠️ With caution
    Hard care · Aggressive · 250 cm · 24–28 °C (75–82 °F)
    Alligator Gar may bully the smaller Tailspotted Oto, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Altifrons Geophagus ⚠️ With caution
    Medium care · Semi-aggressive · 25 cm · 24–28 °C (75–82 °F)
    Altifrons Geophagus may bully the smaller Tailspotted Oto, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
  • Amazon Puffer ⚠️ With caution
    Medium care · Peaceful · 8 cm · 23–28 °C (73–82 °F)
    Your 75 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)
    Angelfish may bully the smaller Tailspotted Oto, 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)
    Angelicus Synodontis may bully the smaller Tailspotted Oto, though its armour makes it a hard meal — give it caves and driftwood to retreat into.

+ 164 more “with caution” pairings — see the interactive checker above.

Avoid

Fish to avoid keeping with a tailspotted oto

  • Discus ⛔ Avoid
    Hard care · Peaceful · 20 cm · 28–31 °C (82–88 °F)
    Temperature needs don't overlap (Tailspotted Oto 22–27 °C vs Discus 28–31 °C).
Interactive tool

Check any fish against a tailspotted oto

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

Tank-mate checker

Will it live with a Tailspotted Oto?

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

  • African Dwarf Frog✅ Compatible
    Peaceful · 4 cm · Medium 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.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
  • Amapá Tetra✅ Compatible
    Peaceful · 4 cm · Medium care · 24–27 °C (75–81 °F)
    • Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Black Darter Tetra✅ Compatible
    Semi-aggressive · 4 cm · Hard care · 21–28 °C (70–82 °F)
    • Peaceful + Semi-aggressive, 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 Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
  • Blackwing Hatchetfish✅ Compatible
    Peaceful · 3.5 cm · Medium care · 23–28 °C (73–82 °F)
    • Both are peaceful, and their water overlaps around 23–27 °C — no size, zone or temperament conflicts.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Blackwing Hatchetfish in a shoal of 6+ or it gets stressed and nippy.
  • Blue Danio✅ Compatible
    Peaceful · 4 cm · Easy care · 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.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Blue Danio in a shoal of 6+ or it gets stressed and nippy.
  • Blue Emperor Tetra✅ Compatible
    Peaceful · 4 cm · Medium care · 23–27 °C (73–81 °F)
    • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Blue Emperor Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Cardinal Tetra✅ Compatible
    Peaceful · 4 cm · Medium care · 23–27 °C (73–81 °F)
    • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Cardinal Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Clown Killifish✅ Compatible
    Peaceful · 3.5 cm · Medium care · 22–26 °C (72–79 °F)
    • Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Clown Killifish in a shoal of 6+ or it gets stressed and nippy.
  • Crimson Red Betta✅ Compatible
    Peaceful · 3.5 cm · Hard care · 24–29 °C (75–84 °F)
    • Both are peaceful, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
  • Emperor Tetra✅ Compatible
    Peaceful · 4 cm · Easy care · 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.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Emperor Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Eyespot Rasbora✅ Compatible
    Peaceful · 3.5 cm · Medium care · 20–25 °C (68–77 °F)
    • Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Eyespot Rasbora in a shoal of 8+ or it gets stressed and nippy.
  • Fire Red Licorice Gourami✅ Compatible
    Peaceful · 3.5 cm · Hard care · 23–28 °C (73–82 °F)
    • Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
  • Flame Tetra✅ Compatible
    Peaceful · 4 cm · Easy care · 22–28 °C (72–82 °F)
    • Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Flame Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Ghost Shrimp✅ Compatible
    Peaceful · 4 cm · Easy care · 18–28 °C (64–82 °F)
    • Both are peaceful, 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 Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Ghost Shrimp in a shoal of 6+ or it gets stressed and nippy.
  • Glowlight Rasbora✅ Compatible
    Peaceful · 3.5 cm · Easy care · 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.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Glowlight Rasbora in a shoal of 8+ or it gets stressed and nippy.
  • Glowlight Tetra✅ Compatible
    Peaceful · 4 cm · Easy care · 22–28 °C (72–82 °F)
    • Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Glowlight Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Golden Dwarf Barb✅ Compatible
    Peaceful · 4 cm · Easy 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 Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Golden Dwarf Barb in a shoal of 6+ or it gets stressed and nippy.
  • Jelly Bean Tetra✅ Compatible
    Peaceful · 4 cm · Medium care · 20–26 °C (68–79 °F)
    • Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Jelly Bean Tetra in a shoal of 10+ or it gets stressed and nippy.
  • Marbled Hatchetfish✅ Compatible
    Peaceful · 4 cm · Medium care · 23–28 °C (73–82 °F)
    • Both are peaceful, and their water overlaps around 23–27 °C — no size, zone or temperament conflicts.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Marbled Hatchetfish in a shoal of 6+ or it gets stressed and nippy.
  • Northern Glowlight Danio✅ Compatible
    Peaceful · 3.5 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.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Northern Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
  • Otocinclus✅ Compatible
    Peaceful · 4 cm · Medium care · 21–26 °C (70–79 °F)
    • Both are peaceful, 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.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Otocinclus in a shoal of 6+ or it gets stressed and nippy.
  • Phoenix Tetra✅ Compatible
    Peaceful · 4 cm · Easy care · 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.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Phoenix Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Pygmy Corydoras✅ Compatible
    Peaceful · 3.2 cm · Easy care · 22–26 °C (72–79 °F)
    • Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Pygmy Corydoras in a shoal of 8+ or it gets stressed and nippy.
  • Rainbow Emperor Tetra✅ Compatible
    Semi-aggressive · 3.6 cm · Medium care · 22–28 °C (72–82 °F)
    • Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Rainbow Emperor Tetra in a shoal of 8+ or it gets stressed and nippy.
  • African Butterfly Cichlid⚠️ With caution
    Semi-aggressive · 8 cm · Medium care · 22–28 °C (72–82 °F)
    • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
  • Amazon Puffer⚠️ With caution
    Peaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
    • Your 75 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Amazon Puffer in a shoal of 6+ or it gets stressed and nippy.
  • Ash Lipped Apisto⚠️ With caution
    Semi-aggressive · 7 cm · Hard care · 24–29 °C (75–84 °F)
    • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
  • Black Ruby Barb⚠️ With caution
    Semi-aggressive · 6 cm · Easy care · 22–26 °C (72–79 °F)
    • Your 75 L tank is below the ~100 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Black Ruby Barb in a shoal of 6+ or it gets stressed and nippy.
  • Bleeding Heart Tetra⚠️ With caution
    Semi-aggressive · 7 cm · Medium care · 23–28 °C (73–82 °F)
    • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Bleeding Heart Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Bright Diamond Tetra⚠️ With caution
    Peaceful · 7 cm · Hard care · 24–28 °C (75–82 °F)
    • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Bright Diamond Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Buenos Aires Tetra⚠️ With caution
    Semi-aggressive · 7 cm · Easy care · 18–26 °C (64–79 °F)
    • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Buenos Aires Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Colombian Tetra⚠️ With caution
    Semi-aggressive · 6.5 cm · Easy care · 24–28 °C (75–82 °F)
    • Your 75 L tank is below the ~114 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Congo Tetra⚠️ With caution
    Peaceful · 8 cm · Medium care · 22–28 °C (72–82 °F)
    • Your 75 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
  • Dwarf Chain Loach⚠️ With caution
    Peaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
    • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Dwarf Chain Loach in a shoal of 6+ or it gets stressed and nippy.
  • Glass Catfish⚠️ With caution
    Peaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
    • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Glass Catfish in a shoal of 6+ or it gets stressed and nippy.
  • Humpbacked Tetra⚠️ With caution
    Semi-aggressive · 5 cm · Hard care · 24–28 °C (75–82 °F)
    • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Humpbacked Tetra in a shoal of 8+ or it gets stressed and nippy.
  • Melon Barb⚠️ With caution
    Peaceful · 7 cm · Easy care · 22–28 °C (72–82 °F)
    • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Melon Barb in a shoal of 8+ or it gets stressed and nippy.
  • Morse Code Corydoras⚠️ With caution
    Peaceful · 5 cm · Medium care · 23–26 °C (73–79 °F)
    • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Morse Code Corydoras in a shoal of 6+ or it gets stressed and nippy.
  • Rounded Filament Barb⚠️ With caution
    Peaceful · 7 cm · Medium care · 22–27 °C (72–81 °F)
    • Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Rounded Filament Barb in a shoal of 6+ or it gets stressed and nippy.
  • Tiger Barb⚠️ With caution
    Semi-aggressive · 7 cm · Easy care · 22–28 °C (72–82 °F)
    • Your 75 L tank is below the ~95 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Tiger Barb in a shoal of 6+ or it gets stressed and nippy.
  • Discus⛔ Not recommended
    Peaceful · 20 cm · Hard care · 28–31 °C (82–88 °F)
    • Temperature needs don't overlap (Tailspotted Oto 22–27 °C vs Discus 28–31 °C).
    • Your 75 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
    • Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
    • Keep Discus 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 a tailspotted oto community tank

Give the group a stable, planted 75 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 tailspotted oto

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

Tailspotted Oto grows to about 3.5 cm, so avoid tank mates small enough to be seen as food — as a rule of thumb, skip anything under roughly 2 cm. Match its water, too: aim for 22–27 °C (72–81 °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.

Tailspotted Oto 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.

FAQ

Frequently asked questions

Can a tailspotted oto live with other fish?

Yes — with the right companions. Our checker finds 167 compatible freshwater species for tailspotted oto. 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 tailspotted oto?

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 tailspotted oto?

Avoid Discus and similar — usually a temperature, size or temperament clash. The full "avoid" list below gives the reason for each.

How big a tank do tailspotted oto tank mates need?

Start from Tailspotted Oto's own minimum and scale up with every addition. The checker above defaults to a 75 L community tank and flags pairings that need more room — drag the slider to match your setup.

← Back to the full Tailspotted Oto care guide