HELP HELP HELP
Do you mean constantly fighting or just a few spats here and there? It may help to know a little more about how you keep your chickens, e.g. free range, coop, coop with run and sizes thereof, other flock members etc. Photos of the little tinkers may also help.
I got 2 RIR & 2EE, you'd think the two RIR would stick together as would the two EE. Not really, Tawny (EE) & Rojo (RIR) are a pair while Dusk (EE) & Ehu (RIR) hang out. However the two RIR will pair off now and then. The EE are another story, Tawny bullies Dusk! I know she's the "alpha", tends to "stand out" while the other 3 grub together. Tawny will pick on Dusk who defends herself but I've never seen her challenge anyone. The order is Tawny, Rojo, Ehu & Dusk although I'd say that later two are even. I'm waiting for the day Dusk turns on Tawny. This happens only when they're out of their Run/Coop, in the Run/Coop they're fine.
I'm letting them sort things out, no one's been hurt nor loss of feathers but IF it gets serious, it'll be "time out".
You seem to have a good plan in place already, so all is well.
Two sisters of my flock had a hum dinger yesterday for a few minutes - i guess it was just a challenge from the lower order one and she was put in her place in a matter of a minute!
All the best
I'm confused here - its seems another member responded in a manner that made me think it was the OP responding.
In the absence of responses to my initial questions, yep, take one of them out and put it in chicken prison for a while. But it may be worth considering what the causes may be - it could be overcrowding, boredom, lack of sufficient food stations etc etc.
Sometimes you just get a mean one. I had a columbine who decided she was boss and mean with it, I put her in with my dad's established birds for a few weeks, they wouldnt take any nonsense from her as the newcomer and when I brought her home a month later she was as good as gold! Apart from that though I would probably keep her seperate for a while, 'chicken prison' is a brilliant term!