I have 5 mixed bunch 5-6wk old chicks (3 silkies, 1 sm bantam and 1 standard mutt) I would like to add in the 4 new kids (3 wks old) (2 silkies and 2 serama). Any suggestions? I was considering adding them in at nightfall, but concerned with the size difference. Was hopeing that at this age there wouldn't be too much difficulty....wanted to ask everyone before I made a mistake first. Thanks in advance for any advice.