1. they are pushing two weeks old at this point. (rhode island reds) I haven't given them any grit and they seem fine. Can I make my own grit/can they find it themselves? 2. They seem bored in the brooder. I want to give them something to do. (I'd be bored out of my mind if I were in there so I want to treat them how I would want to be treated) (one more thing) 3. They are about two weeks old the brooder is about 1.75 feet tall. Can they escape (I've seen many of them fly a few inches up already)?