Ther First off, was this a new incubator? If not, how was it cleaned from the last hatch, stored and cleaned before this one? For the chicks in the 'bator, I think we can rule out a feed issue unless you and the person you bought the eggs from are feeding the exact same kind, batch, etc.. This sounds enviromental to me. Since Marek's doesn't come through the eggs, it would have had to be introduced and then time to go by for it to build up enough to show signs of being there. I'd really like to see a firm time frame here in order to help you. When symptoms started, what they were, where were these chicks kept? Your older birds...how do the eyes look? What are all of the symptoms from them? And again, a time frame please. Pictures would really be great if you can do them. I can't see from here, lol. [/quote There was no incubator. The eggs were hatched by 3 different broody hens. The chicks that got the tremors, and paralysis died in their first 3 days of life. The one chick, now 10 months old had tremors and paralysis but recovered. He seemed fine, but about 1 month later it appeared with rye neck look again. Then I thought, no, it actually appears he is trying to see and only contorts his head when clearly trying to look around. His eyes are not cloudy and have no gray. There is no sign of injury or any swling or discharge. He cannot judge depth or distance well. The older hen was the one who sat and hatched this chick. I say that not really thinking it has anything to do with it. All mamas and babies were in the same coop together. The older hen just developed this apparent eye problem about a week ago.she does know if I'm coming, but only once I'm pretty darn close. They both look normal, but I will take pics and post if you thing that would help.