I completely agree with AlexandCarmen. My cories are fine with days old newborn cory fry in their aquarium with them. I have never once seen the cories actively hunt the fry as the fry swim on the bottom milimeters away from the mouths of the adults. I have even seen cory fry that could easily be eaten by the adults eating happily with the adults the same food directly underneath the noses of the adults. I don't see Endler fry being a snack for cories either, especially because the Endler fry spend most of their time in the mid to upper portions of the tank and the cories spend almost all of their time on the bottom. I would say that your Endler fry having their lives ended prematurely by a cory are very remote.