We got a group of chicks several days ago, but unfortunately our 3+ breeds was 2. And 16 of the 25 were one breed. Now we are having mortality issues with the ones we only had 9 of and lost 2 already (birth defects it seems). So we can get some more at TSC in a few days and were wondering can we add 5 or 6 day-old chicks to our group of 23 or so that would be about a week old at that point? We don't want to cause problems, but doing this as a hobby we really wanted to get some different types to experience the different types of chickens. I've notices a lot of people separate hatches, but they seem to often be several weeks apart. So I wasn't sure if it was ok to mix to a limit of days or never mix them until they are older.