Swordtail and White Cloud Mountain Minnow: Can They Live Together?
Side-by-side comparison
| Factor | Swordtail | White Cloud Mountain Minnow | Assessment |
|---|---|---|---|
| Water temperature | 72–82°F | 60–72°F | Narrow overlap |
| pH | 7–8.4 | 6–8 | Overlap 7–8 |
| Hardness | 12–30 dGH | 5–20 dGH | Overlap 12–20 dGH |
| Adult size | 5.5″ | 1.5″ | 3.7× difference |
| Temperament | Peaceful | Peaceful | Both peaceful |
| Swim level | Mid | Top | Different zones |
| Minimum tank | 20 gal | 10 gal | Together: 26 gal+ |
Shared water parameters
- Temperature both tolerate: 72–72°F
- pH both tolerate: 7–8
- Hardness both tolerate: 12–20 dGH
- Recommended combined tank: 26 gallons or larger
Risks and things to watch
Size mismatch — predation risk
Swordtail reaches 5.5″ while White Cloud Mountain Minnow tops out at 1.5″. As a rough rule, anything that fits in another fish's mouth eventually will. This is the main reason this pairing needs care.
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.
- Swordtail — minimum group of 3. Budget tank space for the whole shoal, not one fish.
- White Cloud Mountain Minnow — minimum group of 6. Budget tank space for the whole shoal, not one fish.
Frequently asked questions
Can swordtail and white cloud mountain minnow live together?
Possible, with conditions. Swordtail and White Cloud Mountain Minnow 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 swordtail and white cloud mountain minnow need together?
Plan for at least 26 gallons. Swordtail alone needs 20 gallons and White Cloud Mountain Minnow 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 72°F. Set the heater to the middle of that window and keep it stable.
What pH works for both?
Aim for pH 7–8, which sits inside both species' comfortable range.
Will swordtail eat white cloud mountain minnow?
It is a real risk. The size difference is 3.7×, and anything that fits in a fish's mouth is eventually treated as food.
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.