Aggressive Chicken, what to do.

[byouland]

I have four chickens, all females who are 2 months old. Recently one of the chickens is attacking one of the other ones. When they are outside of the pen they don't go after each other as much. But inside the coop and pen they peck and draw blood. I even have to separate them when they hold onto each and won't let go. Do I need to get rid of the aggressive chicken? I was told because I have a red light, this might be causing them to fight inside. Do I need to get rid of the light? It's a 25 watt bulb that I keep on inside, so I can see around the coop when I look outside my window.

 

[Den in Penn]

I doubt the red light is causing the aggression. I'd turn the light off. If it is dark they can't see to be aggressive. Since she has only been aggressive in the coop that is the first thing I'd do. It could also be a space thing. Or they are fighting over a favorite perch.