chick plucking specific colored chicks

[Horses n Chicks]

Hi all! I have a 5 week old buff that started plucking my 2 dark Easter egger chicks (also 5 weeks). It seemed like some of my 4 week ols sex link reds might have been joining in. I removed the dark chicks. Other 8 seem to be fine. Will the buff chick start picking on someone else soon? Should it be the one moved out? Or keep the odd colored 2 out. Not sure if chickens can be "racist" or naturally a plucker. I was really excited to try some new breeds besides my faithful, easy sex links.

 

[Horses n Chicks]

The plucked chicks were perfect this morning, badly plucked tonight. Plenty of food and water in their pen.