Ok - got 30 from McMurray on 3/11 and I have one Black Australorp and one SS Hamburg that aren't growing like the others, not active, sit with their feathers kind of ruffled and head down. They will get up and eat/drink but they seem to be getting worse (the SS Hamburg was on her side when I came home today and struggled to get up). They were vacinated for Mareks, are on medicated feed, have received quick chick (first 3 days and one day a week since then). I have isolated them and am feeding boiled egg/yogurt but it seems to be doing nothing for them. I could understand the odd "failure to thrive" chick with a defect, but two with the same thing has me worried. Any ideas?