Well mines really nice but the rooster is another story lol yeah the only thing I'm worried about is just adding 1 and if the rooster tries to mate the lil gal uh oh haha but I think I'll try it. And 7chicks do you have more than 1 bantam in your flock ?
the best way to introduce a new bird is to put her in the coop after dark when the other chickens are roosting
every time you add any new bird to a flock there is a bit of pecking and picking on the new ones ,
this is completely normal and should settle down in a few days or so