My chicks are five weeks old now and have pretty much outgrown the 4'x4' pen in the garage, so I will be moving them into their new coop which is 8'x12". Is this going to be traumatic for them ? Anything I need to do to make the transition less stressful? How about bedding...I have been using pine shavings in the small pen...what do most people use for bedding in their coops? Thanks in advance, for your help.