Tonight I built a brooder from cardboard I got at Lowes. It total dimensions are 3'x5'. I am very happy with how it turned out. My question is this. Should I put up a temporary wall to make the brooder smaller for the first week or so while the chicks are real small...and then take out the wall as they grow? I am getting 10 chicks. Or should I just leave the entire 3'x5' area open from day one? Just thinking that the sq/footage might be too big for day olds and they wont hang together. Obviously I will have a heat lamp on one side. Just looking for some feedback.