4 week old chicks. 2 dead 2 days ago. 2 more in my bathroom right now under a heat lamp. I wasn't able to find anything wrong with the first ones so I assumed they just got too cold. Just now I went in to check on these and found diarrhea with a little blood. Please tell me this isn't coccywhatever. If it is, how do I treat it? Do I treat all my birds? Can I continue to sell the eggs? Somebody help me here please?!?!?