He sounds like he's laking in nutrients. you also have to keep them warm,especially the young ones. The temp should be at 80.especially when they are in this condition.You might have to force feed him to get him going. I had the same problem when my ornate came home with me in may. The cool temps got to him. Also can we see your setup or if you can tell us what you have him in. Also check the care sheet on the forum.