Have 4 RSL that are 22 weeks, 3 of them laying eggs. Have 4 BA 19 weeks none laying. In the past week all their combs have gone from red to pink. Really just noticed today! The BA have just changed to red in the week previous and now have gone back to pink. All the RSL were red and now pink. Have changed from starter to layer 2 weeks ago when the 1st RSL started laying. Have added free oyster shells to run. Have also added DE to the dusting area in the run the past two weeks. Wondering if they are lacking something in their diet? Have not given them many worms or crickets lately. But did give them some cut up pork this morning. Thanks in advance.