My chickens and ducks sleep in the same coop chickens up on a roost, ducks on the floor. Only jerk we have is my Muscovy drake who will grab a chicken if she gets into his space and my broody Muscovy who don't like anyone. But the chickens learn to stay out of their way. My Runners are bullies...
It's best to let them live side by side with fencing in between so they can all get use to each other. Of course they are going to see the new kids on the block as intruders. And there is always one that just can't help but be the bully.