I know this is a pretty open ended ?, but we have 9 golden comets. 2 in the last week seem to be noticeably weaker than the rest. we separated them and started antibiotics. the other girls were harrassing them, pecking at them, one had its comb torn or at least damaged by this.they aren't laying eggs either. in fact we are getting only 4-5 eggs a day from 14 total. the other 5 are BSL, and 1 BSL roo. The GCs are 3 1/2 yrs. is this a sign that they are getting near the end of their life span?