Can Otocinclus Catfish Live With Cardinal Tetra?
Otocinclus Catfish and Cardinal Tetra are compatible. Temperature overlap 73–79°F. Both peaceful.
Conditions: Minimum 20 gallon tank.
Parameter Comparison
| Parameter | Otocinclus Catfish | Cardinal Tetra | Overlap |
|---|---|---|---|
| Temperature | 72–79°F | 73–81°F | 73–79°F ✓ |
| pH Range | 6–7.5 | 4.5–7 | 6–7 ✓ |
| Temperament | peaceful | peaceful | Both peaceful ✓ |
| Max Size | 2" | 2" | Similar ✓ |
| Min Tank Size | 10 gal | 10 gal | 20 gal minimum together |
| Diet | Herbivore | Omnivore | — |
| Care Level | intermediate | intermediate | — |
Tank Requirements for Otocinclus Catfish + Cardinal Tetra
To keep Otocinclus Catfish and Cardinal Tetra together, you need at minimum a 20 gallon tank. Otocinclus Catfish should be kept in a school of 6+. Cardinal Tetra should be kept in a school of 6+. Provide adequate filtration, stable temperature with a heater, and hiding spots to reduce stress.
Species Profiles
Otocinclus Catfish
Otocinclus spp.
Otocinclus catfish (otos) are tiny, peaceful algae eaters that are incredibly effective at controlling soft green algae and diatoms in planted tanks. They are the gold standard for planted tank algae control, often preferred over larger plecos. However, they are somewhat delicate and require established, well-maintained aquariums.
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 →