My chicks are almost 1 week old (I think). They seem very healthy, hopping around, and eating/drinking well. Do I need to let them out of the brooder occasionally, or will they be alright being left in until they are feathered out? I only have 6 right now in a bathtub. Also, how can I get them more used to me? I know I'm not supposed to handle them much initially, but would like them to get to the point that they don't freak out everytime I put my hand in their cage.