We have 4 chicks that are 5-6 weeks old. Today I noticed one of them (a white leghorn), who already seems to be the most dominant of them all, picking at feathers out of the chest of our creme legbar. Later she seems to be picking at feathers on the CL's vent area. I immediately panicked after reading online about cannibalism. The CL does not seem at all bothered by the leghorn doing this but it is very bothersome to me. My concern is the other chickies learning this behavior as well. Here are additional details:We just increased the brooder size to 4 x 2 x 2 about a week ago. There are several roosts in the brooder and the temp is around 70-75 degrees. We will be removing the heat source this week in preparation for the transition outside. It is a a red heat bulb so I do not think it is stress from too much bright light. We are not ready to move them outside yet due to the excessive snow and low temperatures. They are being fed a starter feed with 18% protein. I have read some things that say protein should be 20% - could this be the issue? Aside from changing the brooder about a week ago there have been no other changes. I am concerned about this new behavior. I have read conflicting info. Some say to remove and cull ithe picker mmediately. Others have offered some possible solutions. While I would like nothing more than to attempt these solutions I am scared of putting the rest of the flock at risk of picking this up and it becoming an even bigger problem. Thank you in advance for suggestions.