If it is cocci, you need to get on the horn and start calling the feed stores and maybe Petsmart or the like. Are you feeding medicated feed?
I had turkey poults with cocci once and their poo did not look like that, and they went downhill FAST, within 24 hours, I had lost one but managed to save the rest. They were sick looking and listless. It would be unlikely that they are worms, coming from a big name hatchery, but I guess it could happen. If your chicks are active and being normal, I would give them some yogurt and just keep an eye on them. They are not old enough for pumpkin seeds yet without added grit and some time to get used to the change in diet.