Can Goldfish Live With Cardinal Tetra?
Goldfish and Cardinal Tetra are not compatible due to size mismatch or behavioral conflicts.
Parameter Comparison
| Parameter | Goldfish | Cardinal Tetra | Overlap |
|---|---|---|---|
| Temperature | 65–75°F | 73–81°F | 73–75°F ✓ |
| pH Range | 6.5–7.5 | 4.5–7 | 6.5–7 ✓ |
| Temperament | peaceful | peaceful | Both peaceful ✓ |
| Max Size | 12" | 2" | Size mismatch ✗ |
| Min Tank Size | 20 gal | 10 gal | 20 gal minimum together |
| Diet | Omnivore | Omnivore | — |
| Care Level | beginner | intermediate | — |
Species Profiles
Goldfish
Carassius auratus
Goldfish are among the longest-kept ornamental fish, with a history spanning over 1,000 years. Despite their reputation as easy, bowl-dwelling pets, goldfish actually require spacious tanks with strong filtration. They are cold-water fish that should not be kept with tropical species. Common varieties include comets, fantails, orandas, and ryukins.
Full care guide →Cardinal Tetra
Paracheirodon axelrodi
Cardinal tetras look similar to neon tetras but have a red stripe that extends the entire length of their body (vs only the back half in neons). They prefer softer, more acidic water and are slightly more delicate, but their deeper coloration makes them highly sought after.
Full care guide →