The cardinal tetra is similar in appearance to the neon tetra. You can tell them apart by one particular detail: the difference in the red stripe, which runs from head to tail. The Cardinal tetras are active schooling fish, and they live peacefully in a community aquarium.
| Scientific name | Common Name | Size | Temperament |
| Paracheirodon axelrodi | Cardinal Tetra | 50mm | Peaceful |
| Water Temperature | Water pH | Tank size | Diet |
| 23 to 27 oC | 4.6 - 6.2 | 100 liters | Omnivore |