My chicks (5 weeks old) have blood in their poop. I'm assuming it's Coccidiosis. I read that adding vinegar to their drinking water can help so I've tried that, but it's been four days since I started the vinnegar treatment and nothing has changed. They're on medicated feed as well. None of them are acting sick whatsoever, but the blood is still there. I'm not sure if I should be worried at this point...is this normal/okay? Does anybody have any suggestions for overcoming the bloody poo?