I have a 5week old chick who was hatched from my flock in my incubator. About a week and a half ago he began fumbling and bumbling around, trembling, uncontrollably. He never stops unless he’s resting. My first thought was Marek’s but he has been in my garage in my brooder until I put them out in their own run this week. He is the runt of the group of four. He is alert and very active, just clumsy. I’ve been giving vitamin supplements in water for about a week. Does this seem like a vitamin deficiency?