What's happening? Can you swap for another if this doesn't work out? I never seen where chicks go at it at that young of an age.
It is normal for there to be bullying at any age, but unless the bullying is drawing blood give it some time and they're likely to become friendly. Most chickens do not like being alone. If the bullying has gotten to the point one is being injured, they need to be separated.I brought a 4 days old chick for it. But it's a total disaster. They are not friendly to each other. I'm afraid if one of them get killed.