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Mature females are larger than males.
After a few days, remove a little more than half of the water. Slowly add fresh water back into the tank over the next few hours, but at a reduced temperature of about 70 F. Bring the temperature back up to 78 F over the next two or three days. Feed fish newly hatched brine shrimp to encourage spawning. The then simulates sufficient food supply for successful spawning. Corydoras usually breed in the early morning or evening.