Otocinclus and Chili Rasbora: Can They Live Together?
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Side-by-side comparison
| Factor | Otocinclus | Chili Rasbora | Assessment |
|---|---|---|---|
| Water temperature | 72–79°F | 75–82°F | Overlap 75–79°F |
| pH | 6–7.5 | 5–7 | Overlap 6–7 |
| Hardness | 2–15 dGH | 1–8 dGH | Overlap 2–8 dGH |
| Adult size | 1.5″ | 0.7″ | 2.1× difference |
| Temperament | Peaceful | Peaceful | Both peaceful |
| Swim level | All | Mid | Different zones |
| Minimum tank | 10 gal | 5 gal | Together: 13 gal+ |
Shared water parameters
- Temperature both tolerate: 75–79°F
- pH both tolerate: 6–7
- Hardness both tolerate: 2–8 dGH
- Recommended combined tank: 13 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.
- Otocinclus — minimum group of 6. Budget tank space for the whole shoal, not one fish.
- Chili Rasbora — minimum group of 8. Budget tank space for the whole shoal, not one fish.
Frequently asked questions
Can otocinclus and chili rasbora live together?
Possible, with conditions. Otocinclus and Chili Rasbora 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 13 gallons minimum.
What size tank do otocinclus and chili rasbora need together?
Plan for at least 13 gallons. Otocinclus alone needs 10 gallons and Chili Rasbora needs 5, but combined stocking needs headroom for filtration and swimming space, not just volume.
What temperature suits both species?
Both are comfortable between 75 and 79°F. Set the heater to the middle of that window and keep it stable.
What pH works for both?
Aim for pH 6–7, which sits inside both species' comfortable range.
Will otocinclus eat chili rasbora?
Unlikely. At 1.5″ versus 0.7″ 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.