I've previously kept kribs and cories in a tank with the same footprint to what you have. The kribs had a cave on the one end and tank was heavily planted with lots of breaks in their "line of sight" so there were not too many issues.
When the kribs would breed and the cories would enter their "territory", there were some issues but never to the point of injury. The cories would "high-tail it outta there" - the male krib would chase them for a bit but would return to the cave quickly.