No, remove him from the tank now, seen this happen to another member lfs palming sick fish onto fish keepers, it could be a birth defect but we won't know, or it has fish tb.
Does the fish show any other symptoms like lack of appetite, fin damage, breathing problems, loss of color, etc...? How is the spine bent? Is it bent to one side? Or is it where the spine is almost doubling on itself?
I had a golden wonder killie that the LFS gave to me that had the later type of deformity. It wasn't a disease but rather a birth defect. The fish lived for a year and a half and I think he had a pretty good life considering everything....