I went out to check the babies this morning and found one of my little guys sitting away from the others and looking a little too sleepy. i picked him up and noticed there was gunk in his eyes. i cleaned him off with warm water & He's with me right now, separated from the others. hes the only one like this what could cause this? how can i fix it? i just changed the bedding yesterday and put some shredded paper in that i had laying around.