We have 25 CX chicks, 24 days old, brooder located in garage is 7 x 3 feet with deep wood shavings for bedding, feed at one end, H20 at the other with heat lamp in the center. Birds average at 2# 2 oz. About half have pretty good feathers while the some are showing few body feathers. I have been lowering the temp and am now at 55 degrees at the chicks level. Today observed several sneezes. We have same age RIR chicks, now fully feathered and no issues. Am I too agressive in lowereing the temp? If sneeze becomes persistant, what steps? Thanks p.s. Why such dispairity difference with the feathering?