Hi Kuhni
I don't keep cichlids myself, but I've heard a number of stories about rams eating the eyes of the corys, and I have a one eyed cory that I bought out of a cichlid tank at the lfs, but I don't remember what kind they were. Perhaps it's OK so far because yours are young, but when they mature it might be a different story.
Corys are totally defenseless fish that like to swim in schools with the idea that there's "safety in numbers." In their natural environment the group would just swim away when they feel threatened, but they can't do this in a tank. They just have to live with the stress.
Let me give you an example of this in human terms. Compare this to being a small person living with a very large one who has been known to frequently get drunk, lose his temper and become violent with those around him. While he might not have behaved that way at home, just knowing he might will cause you anxiety. Over time, this fear could lead to depression, and poor health in general. While you might thrive in a different environment, if you cannot escape your home life, you will most likely never become the happy and healthy person you should be.
This is the way I think it is with corys and other, more aggressive tankmates. Actual physical damage is only part of the problem, and of course, after that happens it is too late to do anything.