I have 4 black Sumatra chicks (less than 2 weeks old) and one won't open his eyes. I noticed yesterday that he seemed to have a problem following the other chicks, and also eating and drinking. His appetite seems fine, he appears to have trouble seeing the food. I thought it was maybe a minor injury that he maybe got from being pecked by a fellow chick, but today I am noticing that he keeps scratching his eyes. I have flushed them with warm water but only one opened. Could it be a minor injury? An infection? Is there anything i can use to clean his eyes?