No, keeping only two cory catfish in a 10-gallon tank is not recommended.
Cory catfish are highly social creatures that thrive when kept in larger groups. For their well-being and to allow them to display their natural behaviors, a group of six or more corydoras of the same species is strongly suggested. Keeping just two would likely lead to stress and loneliness for the fish, as they crave safety in numbers.
Tank Size and Species Considerations
While a 10-gallon aquarium might be considered suitable for dwarf corydoras species, it is generally recommended to provide 20 gallons or more for most other varieties. Even for dwarf species in a 10-gallon tank, the minimum group size of six fish still applies to meet their social needs.
Why Group Size Matters for Cory Catfish
- Safety in Numbers: As relatively small fish, cory catfish feel more secure and less stressed when surrounded by their own kind. This natural instinct for schooling helps them feel safe from perceived threats.
- Natural Behavior: In appropriate groups, they will exhibit more natural schooling behaviors, foraging, and social interactions, making them more active and interesting to observe.
- Reduced Stress: A larger group helps to diffuse any potential aggression and provides a constant sense of security, contributing significantly to healthier and happier fish.
Optimal Setup for Cory Catfish
To provide an ideal environment for cory catfish, focus on meeting both their social and spatial needs.
| Factor | Recommendation |
|---|---|
| Minimum Group | 6 or more individuals of the same corydoras species |
| Tank Size | 10 gallons for dwarf species (with appropriate group size) |
| 20+ gallons for most other varieties of cory catfish | |
| Social Needs | Highly social; thrive in established groups |
Ensure the tank is appropriately sized for the specific corydoras species you choose and always aim to keep them in a thriving group of six or more.
