For those who don't know Sheldon he is a Walmart rescue, that was being poured repeatedly by someone into other bettas' cups, and after the second time I had to get a worker to come and separate them I couldn't take it anymore and had to take him home.
Sheldon is now on his way to his new and permanent home. His fins are almost completely grown back and he is doing better than ever, though he may be a bit stressed in a cup again. His new owners should have made it home by tomorrow afternoon and I'll ask them for pictures when he is settled in to post here. But for now I only have some of just before they set out with him.
He was really stressed when he suddenly found himself in a cup again, but calmed down quite a bit after a few minutes, so I think he won't get too stressed on the trip home.
His album, if you want to take a look at how he has improved.