I have never fed chicks a feed with antibiotic in it, which I believe is what Bacitracin is. So can't comment on that other then it will do no good in treating coccidiosis. I probably would not be wanting them to be having any amount of antibiotic's at this point since you do not want to kill...
Well if they had some nasty respiratory thing going on as well you'd definitely notice! If it were my chicks I'd treat the whole batch of them right away with Corid. You can safely double the dose and treat them at 1 tsp per gallon of water the first couple days since you are seeing obvious...
The bloody stool is your biggest tip off. Do they have any other symptoms? Coughing, sneezing, anything respiratory sounding? The only way to know exactly for sure is to have a vet do some tests. That gets pricey quick and takes time. In chicks this age and with the symptoms you...
I would not treat with both. I would stop the Sulmet and use Corid as it actually is the one that takes care of more strains of coccidia. It is also easiest on the chicks themselves. The person you spoke to may have been meaning that the Sulmet can also treat other types of illness? That's...
Oh goodness, I am sorry. Coccidiosis is nasty and it moves fast once it gets to the stage where you are seeing these symptoms.
I would dash back to the store and get some Corid right away. See if they have Corid 20% water soluble powder, labeled for calves, it's often easiest to find...