Hello! Only one of our indian runner ducks hatched, so after 10 days of it being alone we purchased a 3 week old Indian Runner and added him in with the current, younger duckling. The younger duckling is very aggressive and pecks at the old, bigger ducklings eyes. What can I do so that they can live together? We also purchased 2 chicks. THe younger duckling is aggressive with them too. So I separated them out. Any suggestions?