i have 8 RIR that are about 2 weeks old (maybe a bit older) and today i just added 2 few day old silver laced. the RIR are pecking at the new ones eyes and becks. it's not constant but still looks like it may hurt. i'm scared to leave the brooder thinking they may harm them. is this normal? will they harm them? or once they get use to them they will adopt them in?