We have 4 BO's in all at about 20 weeks - 2 and the rest of my flock's headdresses have turned a pink/red color, but 2 of the BO's that had turned pink now look lighter and paler than they did just last week. nobody has laid any eggs yet, but i am worried that something may be wrong with the 2?? they all eat the same food and treats, and these two are acting normal and like the rest of the flock. any ideas? should I be worried?