I introduced Rhode Island white that I keep penned separate as they are a heritage bird that is threatened here, they do confinement a lot better raised as chicks to it than my Rhode Island whites, I know bantam's take less space as do silkies. putting up things even leaning a stray piece of wood or planting a bit of shrubbery inside the anything you can give them to give them some hiding spots if they are ever being picked on usually helps too, maybe take a piece wood and rope and hang a chicken swing or other items that will keep them from getting to bored will also help too, I occasionally add a head of lettuce or cabbage or even a small block of seeds into a net bag and hang it as it's good too for enrichment and keeping them busy as busy chickens don't have time to bully each other. Also have more than 1 feed water station available for them.