What is the smallest Cory catfish?

The smallest Cory catfish is the Corydoras pygmaeus, commonly known as the pygmy Cory. It typically grows to about 1.2 inches (3 cm) in length. These tiny catfish are popular in aquariums for their small size and social behavior, often found in groups, making them ideal for nano tanks. They thrive in well-planted environments with soft substrates.