I'd err with female based on these photos.

Could you get a good closeup of the tail injury from a couple of angles? It looks like the injury goes right through the tail, so some closeups will help to see if you might have a more significant issue.

Food-wise, sounds about right. Did you see a bulge after the worms? That's a good indicator of a good meal, if you can see fhe food bulging a little in the stomach.