German Blue Ram and Pygmy Corydoras: Can They Live Together?
Side-by-side comparison
| Factor | German Blue Ram | Pygmy Corydoras | Assessment |
|---|---|---|---|
| Water temperature | 78–85°F | 72–79°F | Narrow overlap |
| pH | 5.5–7 | 6.2–7.4 | Overlap 6.2–7 |
| Hardness | 1–10 dGH | 2–12 dGH | Overlap 2–10 dGH |
| Adult size | 2.5″ | 1.0″ | 2.5× difference |
| Temperament | Peaceful | Peaceful | Both peaceful |
| Swim level | Bottom | All | Different zones |
| Minimum tank | 20 gal | 10 gal | Together: 26 gal+ |
Shared water parameters
- Temperature both tolerate: 78–79°F
- pH both tolerate: 6.2–7
- Hardness both tolerate: 2–10 dGH
- Recommended combined tank: 26 gallons or larger
Risks and things to watch
Temperature conflict
The comfortable ranges barely meet. Running one species at the edge of its range for months is a slow-burn health problem, not an instant one — which is why it often goes unnoticed.
Group requirements
Compatibility is not only about the two species getting along — each still needs its own social setup met inside the same tank.
- German Blue Ram — no group requirement; single specimens are fine.
- Pygmy Corydoras — minimum group of 8. Budget tank space for the whole shoal, not one fish.
Frequently asked questions
Can german blue ram and pygmy corydoras live together?
Possible, with conditions. German Blue Ram 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 26 gallons minimum.
What size tank do german blue ram and pygmy corydoras need together?
Plan for at least 26 gallons. German Blue Ram alone needs 20 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 78 and 79°F. Set the heater to the middle of that window and keep it stable.
What pH works for both?
Aim for pH 6.2–7, which sits inside both species' comfortable range.
Will german blue ram 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.