I don't use grit. When free ranging I think they get enough gravel type stuff.
With cocci, not all poos will be bloody! I personally witness completely normal poos out of all my chicks when I had seen them do a bloody poo prior to that. But fecal float test was $25 at my vet and confirmed cocci. Blood when dry often looks black in stool. If you do use Corid, do not give vitamins. It works by slowing the growth of the cocci by depriving it of thiamine which I think might be a B vitamin.
The reason I suggested a possible blockage is because of not eating much. The chick might enjoy a little boiled egg yolk, it should be easily digestible if blockage isn't the problem.
I agree I would probably try to keep it with the broody if it has enough energy to not be trampled especially if it is more distressed and I imagine at that age being alone would definitely be stressful. If you do end up needing to treat cocci, which is less likely to happen free ranging, you should probably treat your whole flock. If the chick is standing around sleeping puffed up (more than your normal feather concern), that is a good indicator of Cocci.
My issue with antibiotics is that they don't all treat the same thing and if you're using the wrong kind it won't help. Also they kill all bacteria good and bad. Plus you add the possibility of creating different strains of antibiotic resistant bacteria such as MRSA. I know there are some broad spectrum antibiotics, and they do help sometimes. It's a personal choice.
I did not know that Molasses could cause diarrhea. Thank you for sharing the info! My mind is open and alert, I learn something new everyday.
It's difficult not having an actual diagnosis or knowing what to treat for.
Best wishes for a strong recovery!
