Aww I love an integrated flock! It's so nice when everyone is together and has lots of friends. I currently have 2 duck aviaries but I'd love for it to be 1 big one. It was made to be but I just haven't managed to integrate everyone yet!
I'm in Northeast Florida as well, and I imagine the temps would be fine, but I usually keep my ducklings indoors for awhile, especially if it's during the cooler months. So I don't really have any experience with that.
For integrating with the rest of the flock, I like to keep them with some...