Neck stretching while eating or after eating means that the bird is adjusting his crop which would be normal. What you need to do is feel his crop to see if it's hard (full) just after he goes to roost for the night. Then early the next morning before he eats, feel his crop again. It should be squishy, kind of loose (empty.)
If it's still hard, that means he has an impacted crop. There is also the possibility of impacted gizzard. Let us know how it goes.
If it's still hard, that means he has an impacted crop. There is also the possibility of impacted gizzard. Let us know how it goes.
