11-25-2010, 05:28 PM
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Corydoras will spawn in community aquaria, sometimes quite regularly; but the eggs usually are found and eaten by them or other fish, and if the fry should hatch they too will readily be eaten. If you want to spawn/breed them, it is best to use a separate tank and remove the parents after the eggs are laid.
The female of all cory species is naturally rounder than the male particularly when viewed from above. Increased girth could well be eggs, but it could also mean other health issues.
If it is eggs, the female will be followed/chased around the tank by one or more males who will nudge her periodically. The fertilized eggs, usually 1 or 2 at a time, are carried in the pocket formed by the female's ventral fins and deposited on the underside of a leaf, or sometimes on the aquarium glass. Spawning is often initiated with a water change, as the influx of different parameter water stimulates the fish. If you see any of these signs, it may well be spawning.