I have a 6 day old FBCM chick that seems to have a puffier chest and when I put her next to my ear, I think I hear "clicking" sounds when she breathes. She appears healthy, eats good and is active, but I am REALLY worried! She is in a large tote with another Maran chick and 8 BLRW. I clean the tote every day and have not put any substrate in it yet. I have newspaper with paper towels on the newspaper so they won't slip. They are in my extra bedroom in the house which is 65-70 degrees and they have a heat lamp. I have a thermometer in their tote and they have been 95-100 degrees. I'm feeding them medicated chick starter. I am so scared she will die! I lost a chick once to sour crop when it was 3 weeks old. She is from a dozen mail order eggs and only two hatched. What should I do?? Should I go to the feed store and get the antibiotics that go in their water? Could she have sour crop starting???