I got 5 more chicks today that are 1-2 days old. I out them in with the first batch and the 2 started pecking them but it seems a little more aggressive than it is with the same size chicks. I took them out of the brooder and put them in my duck brooder for "time out" and to let the little guys get established. The duck brooder is like 80 in it so not quite warm enough. The small guys seem to be getting along well with the remaining group of originals. How long do I need to let them go? They were just shipped in the morning so I know they have had a stressful day!
By the way the ducklings and chicks do get along so this isn't a huge concern other than the temp being 80 not 90