Fish comparison
Cardinal Tetra vs Dojo Loach
How the Cardinal Tetra and Dojo Loach compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Cardinal Tetra vs Dojo Loach
The Cardinal Tetra and the Dojo 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 23 to 24 °C and pH 6.5 to 6.5, so a single tank can suit either one. The Dojo 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. If tank space is tight, the Cardinal Tetra needs less room to feel settled; give the Dojo Loach the nod when you have the litres to spare.
Group compatibility overview
Good fit
Workable as-is, only minor advisories to plan around.
1 warning · 2 notes
Temperature
- Cardinal Tetra23–27 °C
- Dojo Loach10–24 °C
pH
- Cardinal Tetra4.5–6.5
- Dojo Loach6.5–8
Hardness
- Cardinal Tetra1–6 dGH
- Dojo Loach5–20 dGH
What to plan for
- Narrow pH overlapTarget pH is 6.5–6.5. Test weekly; use buffered substrate or remineraliser to keep it stable.
- 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.
- Dojo Loach schools, stock at least 3You've planned for 1 dojo loach. Dojo Loach need a group of at least 3 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 |  FishDojo LoachMisgurnus anguillicaudatus |
|---|---|---|
| Category | Fish | Fish |
| Origin | Upper Orinoco and Rio Negro basins | East Asia (Japan, China, Korea, Vietnam) |
| Family | Characidae | Cobitidae |
| Temperature | 23–27 °C | 10–24 °C |
| pH | 4.5–6.5 | 6.5–8.0 |
| Hardness (dGH) | 1–6 | 5–20 |
| Flow rate | Low | Medium |
| Min tank | 75 L | 200 L |
| Adult size | 4–5 cm | 15–20 cm |
| Difficulty | 3 / 5 | 2 / 5 |
| Lifespan | 4–6 yrs | 8–10 yrs |
| Diet | Omnivore | Omnivore |
| Water column | Mid | Bottom |
| Schooling | Yes | Yes |
| Plant safe | Yes | Yes |
| Shrimp safe | Mostly (may eat shrimplets) | No (eats 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 Dojo Loach together?
Yes. Their temperature and pH ranges overlap around 23 to 24 °C and pH 6.5 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 Dojo Loach?
The Dojo Loach is the easier of the two, closer to beginner-friendly, while the Cardinal Tetra leans middle-of-the-road.
Do Cardinal Tetra and Dojo Loach need the same water?
Close to it. Aim for 23 to 24 °C and pH 6.5 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 Dojo Loach?
Space. The Cardinal Tetra wants about 75 litres minimum and the Dojo Loach around 200, so tank size can settle it.