Bicolor Blenny Tank Mates
Bicolor Blenny is semi-aggressive, so its tank mates need choosing with care. Here are the 15 freshwater species that pair well with a bicolor blenny — plus the 2 to avoid — with a live checker you can tune to your own tank.
The best tank mates for a bicolor blenny
- Clown Goby ✅ CompatibleEasy care · Peaceful · 4 cm · 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.
- Neon Goby ✅ CompatibleEasy care · Peaceful · 5 cm · 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.
- Banggai Cardinalfish ✅ CompatibleEasy care · Peaceful · 8 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.
- Blue Damselfish ✅ CompatibleEasy care · Semi-aggressive · 8 cm · 24–27 °C (75–81 °F)Semi-aggressive + 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.
- Firefish ✅ CompatibleEasy care · Peaceful · 8 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.
- Green Chromis ✅ CompatibleEasy care · Peaceful · 8 cm · 24–27 °C (75–81 °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.
- Ocellaris Clownfish ✅ CompatibleEasy care · Semi-aggressive · 8 cm · 24–27 °C (75–81 °F)Semi-aggressive + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Percula Clownfish ✅ CompatibleEasy care · Semi-aggressive · 8 cm · 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.
- Royal Gramma ✅ CompatibleEasy care · Peaceful · 8 cm · 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.
- Six Line Wrasse ✅ CompatibleEasy care · Semi-aggressive · 8 cm · 24–27 °C (75–81 °F)Semi-aggressive + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Yellow Watchman Goby ✅ CompatibleEasy care · Peaceful · 9 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.
- Lawnmower Blenny ✅ CompatibleEasy care · Peaceful · 13 cm · 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.
- Clarkii Clownfish ✅ CompatibleEasy care · Semi-aggressive · 14 cm · 24–27 °C (75–81 °F)Semi-aggressive + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Tomato Clownfish ✅ CompatibleEasy care · Semi-aggressive · 14 cm · 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.
- Mandarin Dragonet ✅ CompatibleHard care · Peaceful · 8 cm · 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.
Bicolor Blenny tank mates that can work with care
- Bicolor Angelfish ⚠️ With cautionMedium care · Semi-aggressive · 15 cm · 24–27 °C (75–81 °F)Your 110 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
- Blue Tang ⚠️ With cautionMedium care · Semi-aggressive · 30 cm · 24–27 °C (75–81 °F)Your 110 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
- Cleaner Wrasse ⚠️ With cautionHard care · Peaceful · 11 cm · 24–27 °C (75–81 °F)Your 110 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
- Coral Beauty Angelfish ⚠️ With cautionEasy care · Semi-aggressive · 10 cm · 24–27 °C (75–81 °F)Your 110 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
- Diamond Goby ⚠️ With cautionMedium care · Peaceful · 15 cm · 24–27 °C (75–81 °F)Your 110 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
- Emperor Angelfish ⚠️ With cautionHard care · Semi-aggressive · 38 cm · 24–27 °C (75–81 °F)Your 110 L tank is below the ~850 L this pairing really wants — crowding raises aggression.
- Flame Angelfish ⚠️ With cautionMedium care · Semi-aggressive · 10 cm · 24–27 °C (75–81 °F)Your 110 L tank is below the ~280 L this pairing really wants — crowding raises aggression.
- Foxface Rabbitfish ⚠️ With cautionMedium care · Semi-aggressive · 24 cm · 24–27 °C (75–81 °F)Your 110 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
+ 9 more “with caution” pairings — see the interactive checker above.
Fish to avoid keeping with a bicolor blenny
- Maroon Clownfish ⛔ AvoidMedium care · Aggressive · 15 cm · 24–27 °C (75–81 °F)Two assertive fish, one genuinely aggressive: Bicolor Blenny and Maroon Clownfish will hold territory and clash.
- Domino Damselfish ⛔ AvoidEasy care · Aggressive · 14 cm · 24–27 °C (75–81 °F)Bicolor Blenny and Domino Damselfish are both territorial and at least one is outright aggressive — expect serious fighting.
Check any fish against a bicolor blenny
Dial in your exact tank size and filter by result — the checker scores every species in our database against a bicolor blenny, with the reasoning for each verdict.
Tank-mate checker
Will it live with a Bicolor Blenny?
We compare each fish against your bicolor blenny on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Banggai Cardinalfish✅ CompatiblePeaceful · 8 cm · Easy 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.
- Blue Damselfish✅ CompatibleSemi-aggressive · 8 cm · Easy care · 24–27 °C (75–81 °F)
- Semi-aggressive + 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.
- Clarkii Clownfish✅ CompatibleSemi-aggressive · 14 cm · Easy care · 24–27 °C (75–81 °F)
- Semi-aggressive + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Clown Goby✅ CompatiblePeaceful · 4 cm · Easy 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.
- Firefish✅ CompatiblePeaceful · 8 cm · Easy 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.
- Green Chromis✅ CompatiblePeaceful · 8 cm · Easy care · 24–27 °C (75–81 °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.
- Keep Green Chromis in a shoal of 6+ or it gets stressed and nippy.
- Lawnmower Blenny✅ CompatiblePeaceful · 13 cm · Easy 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.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Mandarin Dragonet✅ CompatiblePeaceful · 8 cm · Hard 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.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Neon Goby✅ CompatiblePeaceful · 5 cm · Easy 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.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Ocellaris Clownfish✅ CompatibleSemi-aggressive · 8 cm · Easy care · 24–27 °C (75–81 °F)
- Semi-aggressive + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Percula Clownfish✅ CompatibleSemi-aggressive · 8 cm · Easy 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.
- Royal Gramma✅ CompatiblePeaceful · 8 cm · Easy 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.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Six Line Wrasse✅ CompatibleSemi-aggressive · 8 cm · Easy care · 24–27 °C (75–81 °F)
- Semi-aggressive + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Tomato Clownfish✅ CompatibleSemi-aggressive · 14 cm · Easy 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.
- Yellow Watchman Goby✅ CompatiblePeaceful · 9 cm · Easy 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.
- Bicolor Angelfish⚠️ With cautionSemi-aggressive · 15 cm · Medium care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
- Blue Tang⚠️ With cautionSemi-aggressive · 30 cm · Medium care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
- Cleaner Wrasse⚠️ With cautionPeaceful · 11 cm · Hard care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
- Coral Beauty Angelfish⚠️ With cautionSemi-aggressive · 10 cm · Easy care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
- Diamond Goby⚠️ With cautionPeaceful · 15 cm · Medium care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
- Emperor Angelfish⚠️ With cautionSemi-aggressive · 38 cm · Hard care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~850 L this pairing really wants — crowding raises aggression.
- Flame Angelfish⚠️ With cautionSemi-aggressive · 10 cm · Medium care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~280 L this pairing really wants — crowding raises aggression.
- Foxface Rabbitfish⚠️ With cautionSemi-aggressive · 24 cm · Medium care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
- Kole Tang⚠️ With cautionSemi-aggressive · 18 cm · Medium care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~280 L this pairing really wants — crowding raises aggression.
- Melanurus Wrasse⚠️ With cautionSemi-aggressive · 12 cm · Medium care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
- Naso Tang⚠️ With cautionSemi-aggressive · 45 cm · Hard care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~680 L this pairing really wants — crowding raises aggression.
- Purple Tang⚠️ With cautionSemi-aggressive · 25 cm · Medium care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~280 L this pairing really wants — crowding raises aggression.
- Regal Angelfish⚠️ With cautionSemi-aggressive · 25 cm · Hard care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~480 L this pairing really wants — crowding raises aggression.
- Sailfin Tang⚠️ With cautionSemi-aggressive · 40 cm · Medium care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~570 L this pairing really wants — crowding raises aggression.
- Yellow Coris Wrasse⚠️ With cautionPeaceful · 12 cm · Easy care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~210 L this pairing really wants — crowding raises aggression.
- Yellow Tang⚠️ With cautionSemi-aggressive · 20 cm · Medium care · 24–27 °C (75–81 °F)
- Your 110 L tank is below the ~280 L this pairing really wants — crowding raises aggression.
- Domino Damselfish⛔ Not recommendedAggressive · 14 cm · Easy care · 24–27 °C (75–81 °F)
- Bicolor Blenny and Domino Damselfish are both territorial and at least one is outright aggressive — expect serious fighting.
- Maroon Clownfish⛔ Not recommendedAggressive · 15 cm · Medium care · 24–27 °C (75–81 °F)
- Two assertive fish, one genuinely aggressive: Bicolor Blenny and Maroon Clownfish will hold territory and clash.
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 bicolor blenny community tank
Give the group a stable, planted 110 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 a bicolor blenny
Being semi-aggressive, bicolor blenny 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.
Bicolor Blenny 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 24–27 °C (75–81 °F), pH 8–8.4 and 8–12 dGH. Fish needing very different conditions — coldwater species, or hard-water lovers against a soft-water fish — rarely thrive side by side.
Bicolor Blenny 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 a bicolor blenny live with other fish?
Yes — with the right companions. Our checker finds 15 compatible freshwater species for bicolor blenny. 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 bicolor blenny?
Easy, peaceful, similarly-sized species top the list — for example Clown Goby, Neon Goby, Banggai Cardinalfish. Use the checker above to match against your own tank size.
What fish should you avoid keeping with a bicolor blenny?
Avoid Maroon Clownfish, Domino Damselfish and similar — usually a temperature, size or temperament clash. The full "avoid" list below gives the reason for each.
How big a tank do bicolor blenny tank mates need?
Start from Bicolor Blenny's own minimum and scale up with every addition. The checker above defaults to a 110 L community tank and flags pairings that need more room — drag the slider to match your setup.