Thank you so much. Can you please recommend a good antibiotic to have on hand?Five on, ten off, and five on is a good regiment to get all types of worms. The discolored poo could also be from a change of feed, perhaps she got into something that resulted in a dark stool. The hens do not look sick so a normal de-worming should take care of what is bothering them. It is not likely the hens have cocci unless they were stressed and it is still rare that a grown pea comes down with cocci.
You only have another day of worming so I would wait and give the toltrazuril between the worming treatments. It is the chicks that are in need of it so I wouldn't put it off any longer than you have to.
Antibiotics are good to have on hand, just make sure it is needed before giving it. It does more harm than good to give antibiotics as a preventative.