I don't recommend putting corydoras in with any cichlid that has any territorial instinct. (which is most of them)
Corydoras,given their sweet nature, don't understand the aspect of keeping territories and respecting other fish's territories. If they persist in not caring about boundaries they will either be eaten by the bigger cichlids (which can kill both if the corydora gets lodged in the mouth) or if the cichlid is too small to eat it, he will attack the eyes.