Help Please, sick chick!

[simishelly]

So I bought 6 chicks on Saturday. 3 Rhode Island Reds and 3 White brahma. They are about 2 and a half weeks old. They have all been fine until today. One of the Rhode Island Reds was just laying on the floor very lathargic. We checked its bottom and it was crusted over, so we used a warm wash cloth and warm water to clean its bottom and a large amount of poop came out. It is breathing but still just lying on the floor not moving. I have left one other chick with it for company but removed the other 4. Is there anything else I should do?

 

[chickengeorgeto]

In my opinion I would take the other chick out also or maybe destroy all 6. Do realize that you have given me very little to go on but it isn't looking good.
http://extension.unh.edu/resources/files/Resource000793_Rep817.pdf

 

[SlipsWife]

All chicks were hatched around 2-24-13. We bought 6 red pullets and 2 bantams from TSC. One of the banty's was very small and passed away about 4 days later. We then got 2 white leghorns from a local feedstore that breed their own. They said they didn't have any complaints of deaths from last year. One of the leghorns has always been a little 'slower' than the others. She eats and drinks ok, I haven't noticed any unusual poop, she is smaller than the others her size (but still bigger than the banty) and she can run with the others for a little distance but seems to get winded/tired very easily and then sleeps a lot. We often find her off by herself because she can't seem to catch up. Should we be concerned? We haven't quarantined her because she's been like this for awhile and no one else seem sicks. We are getting another order of chicks on Friday and they will be seperated from the others for a few weeks at least. I thought maybe she had gotten to hot at some point or she's blind (husband doesn't think so) or she's just extra special but now I am worried I might be exposing my family and other chicks...what should we do?