That size is more than enough especially for a male, male should be lean (big difference with being kept small) even a large male 1400 grams or so never need anything larger than a 75 grams rat.
To give you an idea I feed rats in the 55 grams range to males 700 grams and over and max out at 75 grams for my large males.
Males are fed once a week however I skip a week every now and than.
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