Fish comparison
Cardinal Tetra vs Chili Rasbora
How the Cardinal Tetra and Chili Rasbora compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Cardinal Tetra vs Chili Rasbora
The Cardinal Tetra and the Chili Rasbora come up together a lot when people are choosing a fish, and they are close enough to weigh side by side. Both are happy somewhere around 24 to 27 °C and pH 4.5 to 6.5, so a single tank can suit either one. Neither is harder than the other to keep, so the choice comes down to look and stocking rather than skill. If tank space is tight, the Chili Rasbora needs less room to feel settled; give the Cardinal Tetra the nod when you have the litres to spare.
Group compatibility overview
Excellent fit
Every key parameter overlaps and no major conflicts surfaced.
4 notes
Temperature
- Cardinal Tetra23–27 °C
- Chili Rasbora24–28 °C
pH
- Cardinal Tetra4.5–6.5
- Chili Rasbora4–6.5
Hardness
- Cardinal Tetra1–6 dGH
- Chili Rasbora1–4 dGH
What to plan for
- Cardinal Tetra schools, stock at least 8You've planned for 1 cardinal tetra. Cardinal Tetra need a group of at least 8 to feel safe and shoal naturally, below that they're stressed and lose colour. Dial up the count, or remove the species.
- Chili Rasbora schools, stock at least 10You've planned for 1 chili rasbora. Chili Rasbora need a group of at least 10 to feel safe and shoal naturally, below that they're stressed and lose colour. Dial up the count, or remove the species.
- No bottom teamNo bottom-dwelling fish or shrimp. A small group of corydoras or a shrimp colony picks up leftover food and keeps detritus in check.
- 67% of your fish swim in the midHeavy concentration in a single zone. Spreading stocking across all three levels makes the tank read fuller for the same bioload.
Full attributes
Every parameter, side by side| Parameter |  FishCardinal TetraParacheirodon axelrodi |  FishChili RasboraBoraras brigittae |
|---|---|---|
| Category | Fish | Fish |
| Origin | Upper Orinoco and Rio Negro basins | Southwestern Borneo blackwater swamps |
| Family | Characidae | Cyprinidae |
| Temperature | 23–27 °C | 24–28 °C |
| pH | 4.5–6.5 | 4.0–6.5 |
| Hardness (dGH) | 1–6 | 1–4 |
| Flow rate | Low | Still to Low |
| Min tank | 75 L | 30 L |
| Adult size | 4–5 cm | 1.7–2 cm |
| Difficulty | 3 / 5 | 3 / 5 |
| Lifespan | 4–6 yrs | 3–4 yrs |
| Diet | Omnivore | Micropredator |
| Water column | Mid | Mid to Top |
| Schooling | Yes | Yes |
| Plant safe | Yes | Yes |
| Shrimp safe | Mostly (may eat shrimplets) | Yes (adults and adult shrimp) |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Cardinal Tetra and Chili Rasbora together?
Yes. Their temperature and pH ranges overlap around 24 to 27 °C and pH 4.5 to 6.5, so one set of water conditions keeps both comfortable. Match group sizes and cover the usual planted-tank basics and they share a tank fine.
Which is easier to keep, the Cardinal Tetra or the Chili Rasbora?
They sit at the same care level, both middle-of-the-road, so neither is the obvious beginner pick. The decision is really about the look you're after.
Do Cardinal Tetra and Chili Rasbora need the same water?
Close to it. Aim for 24 to 27 °C and pH 4.5 to 6.5 and you're in the shared sweet spot for both. Full ranges are in the table above.
What's the main difference between the Cardinal Tetra and the Chili Rasbora?
Space. The Cardinal Tetra wants about 75 litres minimum and the Chili Rasbora around 30, so tank size can settle it.