The minimum tank size for Julii Cory is 20 gallons. While they are small fish, they prefer to be in a group of at least 6. Since the tank must be able to accommodate the entire group of fish, a tank smaller than 20 gallons is not recommended. Of course, a larger tank can be beneficial, especially if additional fish are kept.
Julii Cory are hardy fish and they are easy to care for. They accept a relatively wide range of water conditions in regards to the water hardness and pH level. However, they do required well oxygenated water and they will not tolerate poor water quality that are high in nitrites and nitrates.
The optimum temperature range for Julii Cory is 73-79°F (23-26°C). However, they are known to survive in a wider range of temperature of 68-84°F (20-29°C). Since Julii Cory prefer cooler temperatures than some of the other Corydoras species, it is best to avoid temperatures above 84°F. The optimum water pH for Julii Cory is 6.0-7.5. The optimum alkalinity is between 3° and 10° dKH (54ppm to 180ppm).