Fish comparison
Angelfish vs Cardinal Tetra
How the Angelfish and Cardinal Tetra compare on care, size, water and temperament, and which fish suits your tank.
By Mike ElmiraUpdated
TL;DR, Angelfish vs Cardinal Tetra
The Angelfish and the Cardinal Tetra 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 6 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 Cardinal Tetra needs less room to feel settled; give the Angelfish the nod when you have the litres to spare.
Group compatibility overview
Excellent fit
Every key parameter overlaps and no major conflicts surfaced.
3 notes
Temperature
- Angelfish24–30 °C
- Cardinal Tetra23–27 °C
pH
- Angelfish6–7.5
- Cardinal Tetra4.5–6.5
Hardness
- Angelfish3–15 dGH
- Cardinal Tetra1–6 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.
- 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.
- 100% 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 |  FishAngelfishPterophyllum scalare |  FishCardinal TetraParacheirodon axelrodi |
|---|---|---|
| Category | Fish | Fish |
| Origin | Amazon basin, South America | Upper Orinoco and Rio Negro basins |
| Family | Cichlidae | Characidae |
| Temperature | 24–30 °C | 23–27 °C |
| pH | 6.0–7.5 | 4.5–6.5 |
| Hardness (dGH) | 3–15 | 1–6 |
| Flow rate | Low | Low |
| Min tank | 200 L (height ≥ 45 cm) | 75 L |
| Adult size | 12–15 cm body (20+ cm height with fins) | 4–5 cm |
| Difficulty | 3 / 5 | 3 / 5 |
| Lifespan | 8–12 yrs | 4–6 yrs |
| Diet | Omnivore (micropredator) | Omnivore |
| Water column | Mid | Mid |
| Schooling | No (juveniles group; adults pair-bond) | Yes |
| Plant safe | Mostly | Yes |
| Shrimp safe | No (will hunt) | Mostly (may eat shrimplets) |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Angelfish and Cardinal Tetra together?
Yes. Their temperature and pH ranges overlap around 24 to 27 °C and pH 6 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 Angelfish or the Cardinal Tetra?
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 Angelfish and Cardinal Tetra need the same water?
Close to it. Aim for 24 to 27 °C and pH 6 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 Angelfish and the Cardinal Tetra?
Temperament is the big one. The Angelfish is territorial when breeding and the Cardinal Tetra is peaceful, which changes who you can house them with.