Fish comparison
Cardinal Tetra vs Kuhli Loach
How the Cardinal Tetra and Kuhli Loach compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Cardinal Tetra vs Kuhli Loach
The Cardinal Tetra and the Kuhli Loach 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 5.5 to 6.5, so a single tank can suit either one. The Kuhli Loach is the more forgiving of the two, which matters if this is an early tank, while the Cardinal Tetra rewards a bit more attention. Read the full care notes on each below and pick the one whose look and pace fit the tank you're building.
Group compatibility overview
Excellent fit
Every key parameter overlaps and no major conflicts surfaced.
2 notes
Temperature
- Cardinal Tetra23–27 °C
- Kuhli Loach24–28 °C
pH
- Cardinal Tetra4.5–6.5
- Kuhli Loach5.5–7
Hardness
- Cardinal Tetra1–6 dGH
- Kuhli Loach2–10 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.
- Kuhli Loach schools, stock at least 6You've planned for 1 kuhli loach. Kuhli Loach need a group of at least 6 to feel safe and shoal naturally, below that they're stressed and lose colour. Dial up the count, or remove the species.
Full attributes
Every parameter, side by side| Parameter |  FishCardinal TetraParacheirodon axelrodi |  FishKuhli LoachPangio kuhlii |
|---|---|---|
| Category | Fish | Fish |
| Origin | Upper Orinoco and Rio Negro basins | Java, Sumatra, Malay Peninsula |
| Family | Characidae | Cobitidae |
| Temperature | 23–27 °C | 24–28 °C |
| pH | 4.5–6.5 | 5.5–7.0 |
| Hardness (dGH) | 1–6 | 2–10 |
| Flow rate | Low | Low to Medium |
| Min tank | 75 L | 75 L |
| Adult size | 4–5 cm | 8–10 cm |
| Difficulty | 3 / 5 | 2 / 5 |
| Lifespan | 4–6 yrs | 10+ yrs |
| Diet | Omnivore | Omnivore (sinking, nocturnal) |
| Water column | Mid | Bottom |
| Schooling | Yes | Yes (loose group) |
| Plant safe | Yes | Yes |
| Shrimp safe | Mostly (may eat shrimplets) | Yes (adults safe with 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 Kuhli Loach together?
Yes. Their temperature and pH ranges overlap around 24 to 27 °C and pH 5.5 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 Kuhli Loach?
The Kuhli Loach is the easier of the two, closer to beginner-friendly, while the Cardinal Tetra leans middle-of-the-road.
Do Cardinal Tetra and Kuhli Loach need the same water?
Close to it. Aim for 24 to 27 °C and pH 5.5 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 Kuhli Loach?
It comes down to look, size and pace rather than one being flatly better. The table above lays the numbers out row by row.