Some of my chickens lay odd shaped, thin shelled eggs and when cracked open the white is almost like water. They are not old about a year and a half old. Others in the same flock lay nice eggs, what can i do, ive checked different diseases, they dont appear to have any disease. they get corn to snack on, table scraps, and layer crumbles. They have a adiquite coop with a large fenced yard and are let out in the evening to forge for a few hours before bed time. Any help would be appreciated, i have been researching it and i have come down to the feed content, possible high vanadium?? levels in the feed.