Medium rats are pretty big for an adult male so if that is what he was eating chances how he is fasting to catch up, which assuming he has a good body size is nothing to worry about.
While suggested the 10% rules does not apply to adults so please keep that in mind.
Males greatly benefit from smaller preys rats (between 55 to 75 grams weekly) with skip meals in between.
Also keep in mind that adult tend to take a bit longer to adjust and feed sometimes as long as several months.
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