Guppy and Pygmy Corydoras: Can They Live Together?
Side-by-side comparison
| Factor | Guppy | Pygmy Corydoras | Assessment |
|---|---|---|---|
| Water temperature | 72–82°F | 72–79°F | Overlap 72–79°F |
| pH | 7–8 | 6.2–7.4 | Tight overlap |
| Hardness | 8–20 dGH | 2–12 dGH | Overlap 8–12 dGH |
| Adult size | 2.0″ | 1.0″ | 2.0× difference |
| Temperament | Peaceful | Peaceful | Both peaceful |
| Swim level | Top | All | Different zones |
| Minimum tank | 10 gal | 10 gal | Together: 16 gal+ |
Shared water parameters
- Temperature both tolerate: 72–79°F
- pH both tolerate: 7–7.4
- Hardness both tolerate: 8–12 dGH
- Recommended combined tank: 16 gallons or larger
Risks and things to watch
No major conflicts
Parameters, size and temperament all line up. The usual rules still apply: cycle the tank, respect group sizes, and do not overstock.
Group requirements
Compatibility is not only about the two species getting along — each still needs its own social setup met inside the same tank.
- Guppy — minimum group of 3. Budget tank space for the whole shoal, not one fish.
- Pygmy Corydoras — minimum group of 8. Budget tank space for the whole shoal, not one fish.
Frequently asked questions
Can guppy and pygmy corydoras live together?
Possible, with conditions. Guppy and Pygmy Corydoras can work, but this is a conditional yes rather than easy one. Read the risk section below before buying — the pairing usually fails for one specific reason, not because of general incompatibility. Plan on 16 gallons minimum.
What size tank do guppy and pygmy corydoras need together?
Plan for at least 16 gallons. Guppy alone needs 10 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 72 and 79°F. Set the heater to the middle of that window and keep it stable.
What pH works for both?
Aim for pH 7–7.4, which sits inside both species' comfortable range.
Will guppy eat pygmy corydoras?
Unlikely. At 2.0″ 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.