When silkies or other bantams are raised with standard fowl they seem to fit in far better than when introduced into an established flock. They will be picked on - it's the nature of the pecking order, and they do look different. Their crests and diminished vision make them vulnerable to attacks from others. Given hiding places and enough space they MAY be successfully added to your flock. One way of integrating them is to have two pens. Place the silkies in the one pen during quarantine and then add the calmest hen in your existing flock to their pen. Wait a day or so and add another and so on so that in effect you are adding the present birds to the silkies. Good luck.