Adding chicks?

[LoupGarou]

I have three two-month-old buff orpington pullets in their own pen. I also have two one-month-old male chicks. I'd like to move both groups (or at least one of the roosters and the pullets) into a larger enclosure in about a month. Will I need to keep them separated with some kind of netting while they get used to each other or will it be safe to put them all together?

 

[LoupGarou]

Guidelines, anyone? I know it's a month away, but I have to make coop plans in advance since I'll most likely be doing it myself.