I've got a little deformed CT that I "rescued" from our LFS. I was super worried about him because on top of his spine mishape, he wasn't eating. I had finally resigned myself to the fact that he was quite happy to starve to death, and didn't attempt to feed him for 3 days. On the 4th I dropped in 2 pellets, and sat on the couch. Within minutes I could hear "chonk chonk". He was eating!
It took him literally almost a month to settle in to his new environment and eat. He now happily eats 4 pellets once a day. No more, no less.