red belly like that = shedding, like nate said, usually happens about 1-2 weeks before a shed for mine.
Leave him alone for a week or two, don't try feeding for that same length of time. he needs time to settle in. Going nuts because he was placed in another cage is because he was placed in a new cage that he was probably just exploring and smelling. small rats is fine for ever. get him checked out by a vet, and get him an xray and see whats up.
~mike
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