Hello, I'm new to raising chicks, never have done it before, I just bought 12 on Tuesday and they are doing well, happy little guys. So here's my questions: 1) I just bought 2 more chicks, they're kind of small, maybe 60% the size of the ones I got Tuesday, do I need to worry about the others hurting them? I watched for about 10 minutes and it seemed okay, but I'm still unsure. 2) What is the purpose of the red heat bulbs? I bought red because I was told it's better but I'm unsure why. 3) What temperatures should it be inside my brooder? Right now it sits at around 76-78 degrees. Thanks.