Not all will hunch, or fluff up. I had a severe case of Coccidiosis one year in my chicks, & they acted normal, but had lots of bloody diarrhea, & intestinal shedding. They had to be treated twice after they moved outside, they picked up a different strain then.
Okay, that's fine. I usually treat the day I see it.
Usually normal intestinal shedding is a orangish color. If there's red in it, then it's most likely Coccidiosis, or worms, but worms are more common in older young birds, & older birds.