Like Mike mentioned I would also wait a minimum of a couple weeks before feeding a single small meal. Since it has been going on a while now, I would keep the meals small, only one food item at a time and less frequent meals for at least a couple months to let it's system calm down for a period of time. I would also try to get it's hot spot temp up some to help it digest but still keep a cooler side to the cage.
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Randy Whittington