Good afternoon all. My 18 chicks are about 5 weeks. This morning when I woke up, I saw where my chicks have pecked one chicks back area raw, and I can see on other chicks where they are pecking near the face/eyes. I've had them all in the same box (washer/dryer size box), with white lights, at about 65* the last week or so. No problems up until now! So my first question is: Why all of the sudden? Are they growing too big for the space? Is it just pecking order being demonstrated? Should I figure out which chick is doing it and get rid of it? Should I change to red lights? Expand the brooded area? There's plenty of room for them to each eat/drink, so no one should be fighting for food/water...? Can I tell at 5 weeks what sex they are? I have Rhode Island Red, Barred Rock, one Easter Egger chick, and some Dominique chicks... Any advice would be helpful. Patiently waiting for some experts advice!