We got some chicks in the mail from a hatchery and long story short most did not make it. We have 6 lone survivors out of 31. Very sad day. I talked to the hatchery and they are sending replacements but the 6 will be 2 weeks and a couple days at the time of their arrival. All are vaccinated. Do you think it will be safe to let them be in with the older ones and not have fighting issues. I wasn't sure if they would be like older chickens and need time to get use to them or not. Any advice would be great. Thank you.