That should be fine. Cory's hang out on the bottom most of the time and are extremely peaceful fish. The only aggression I have in my tank are from female guppies holding fry. They tend to chase and bump other guppies when there is food, but only nudge the Cory's during feeding time. The Cory's are persistent and come right back in to the food. If the entire shoal of Cories descends on a shrimp pellet or sinking wafer, the other fish don't even try to get in on it. I spread the shrimp pellets out for the Cory's, but the largest pregnant guppy will just patrol each site and try to hog it all. I think it's fun to watch though.