Betta and Pygmy Corydoras: Can They Live Together?
Side-by-side comparison
| Factor | Betta | Pygmy Corydoras | Assessment |
|---|---|---|---|
| Water temperature | 76–82°F | 72–79°F | Overlap 76–79°F |
| pH | 6.5–7.5 | 6.2–7.4 | Overlap 6.5–7.4 |
| Hardness | 3–15 dGH | 2–12 dGH | Overlap 3–12 dGH |
| Adult size | 2.5″ | 1.0″ | 2.5× difference |
| Temperament | Aggressive | Peaceful | Aggression risk |
| Swim level | Top | All | Different zones |
| Minimum tank | 5 gal | 10 gal | Together: 11 gal+ |
Shared water parameters
- Temperature both tolerate: 76–79°F
- pH both tolerate: 6.5–7.4
- Hardness both tolerate: 3–12 dGH
- Recommended combined tank: 11 gallons or larger
Risks and things to watch
Territorial aggression
Betta defends territory and will chase. Long tanks with broken sight lines reduce this; small square tanks make it worse.
Group requirements
Compatibility is not only about the two species getting along — each still needs its own social setup met inside the same tank.
- Betta — one per tank only.
- Pygmy Corydoras — minimum group of 8. Budget tank space for the whole shoal, not one fish.
Frequently asked questions
Can betta and pygmy corydoras live together?
Not recommended. We do not recommend housing Betta with Pygmy Corydoras. The conflicts below are structural — they are not solved by a bigger tank or more plants. Choose a different tank mate instead.
What size tank do betta and pygmy corydoras need together?
Plan for at least 11 gallons. Betta alone needs 5 gallons and Pygmy Corydoras needs 10, but combined stocking needs headroom for filtration and swimming space, not just volume.
What temperature suits both species?
Both are comfortable between 76 and 79°F. Set the heater to the middle of that window and keep it stable.
What pH works for both?
Aim for pH 6.5–7.4, which sits inside both species' comfortable range.
Will betta eat pygmy corydoras?
Unlikely. At 2.5″ versus 1.0″ the size gap is not large enough for predation, though fry and juveniles are never safe in a community tank.
How should the tank be arranged?
Use plants, wood and rock to break sight lines, keep open swimming space along the front, and add the more territorial species last so it cannot claim the whole tank before the other settles in.
Explore further
Assessment generated from our compatibility methodology: parameter overlap, adult size ratio, temperament and swimming zone. Reviewed by Marcus Rivera.