Hey everyone. this is my first time ever having chickens. i just bought 6 little chicks and they are in an extra large dog crate right now. how far away or how close should the heat lamp be? its been a few hours and they are ever so slowly moving farther from the lamp. is it too far down? its a 250 watt bulb. the dog crate is maybe a little over like 2ft tall and I have the lamp hanging about halfway in the create.