Got my ducklings today. I ordered 6 and one did not make it after speaking with Metzers they are going to send another Rouen duckling to replace the one I lost and then a random duckling so its not shipped alone. My question is when the other ducklings get here in a few days do I need to introduce them slowly or at this age will they do okay just being placed together. Also will having 6 Rouens and one other breed make a difference? Thanks. They are so pretty