I took my 8 week old chick out from the pen with hen and roo. Hen is due to hatch out eggs in about 9 days! I moved one of my smaller black silkie chicks with the 8 week old chick.The black chick is about the same age. I watched noone picked on each other i made sure everyone was eating and drinking before I left. They even was standing aganist each other when I left! I am wanting to add all 6 of my chicks into the same cage together so I am thinking of adding a chick each week till all six are in the same cage and everyone is doing great. I was worried about moving the 8 week old chick from hen and roo because he seemed so attached but everything went fine! I am so happy!