Ok good. Sometimes I have seen people giving just electrolyte water during heat spells and that actually making chickens sick. That’s another thing we can rule out. While they’re on the Corid don’t give them any extra vitamins because it can counteract the corid which works by blocking thiamine that cocci needs to survive. So just the corid in the water for now and if it is a cocci overload you should see improvement quickly but keep them on it a full five days, maybe seven then you can lower the dose for another five days.