Quote Originally Posted by jkunz View Post
...is doing this strange thing where it looks like it is sort of stretching its back/neck and then making big swallowing motions. This happens from time to time even when there's no food in the tank. I've never seen the other one make similar motions. Any ideas?
not to second guess John, but could it be shedding? Maybe you coud place it in a rubbermaid container with food to monitor his/her reaction to it and see if there is any physical limitations that cause trouble eating.