Can cardinal tetras and guppies live together?
With care
Cardinal tetras and guppies can share a tank, but there is something to watch.
Why
- Their pH ranges overlap only between 6.8–7.0.
What each one needs
| Cardinal tetra | Guppy | Both | |
|---|---|---|---|
| Temperature | 73–84°F (23–29°C) | 72–82°F (22–28°C) | 73–82°F (23–28°C) |
| pH | 5.0–7.0 | 6.8–7.8 | 6.8–7.0 |
| Minimum tank | 20 gal (76 L) | 5 gal (19 L) | 20 gal (76 L) |
| Keep at least | 6 | 3 | |
| Adult size | 2 in (5.1 cm) | 2 in (5.1 cm) |
The smallest tank for both
A 20 gallons (76 L) tank holds 6 cardinal tetras and 3 guppies at about 45% of its stocking limit, which leaves room for more.