I wouldn't worry too much. My almost 2 yr old male is going on 2 months of not eating as well. He went from 951 grms late December to 931 grams the other day I don't think that an amount to be concerned about. He was always a great eater until first part of January. I changed him to a every other week schedule until spring and he gets going again.
Thought for sure he'd eat last night. At least he was interested in his f/t rat but wouldn't strike for all my trying. I left it in his cage overnight but it was still there. Couple hours after I left it I checked and he was crawling all over his cage but no dice.