Figment (my corn) is about 625G now. He was happily eating a 35-45G mouse weekly, but I have moved him to an every two week schedule of the same size mouse. If he starts losing weight, I will go to ten days or one week, then two weeks, etc.
I have heard mixed things about feeding rats to corns. Every once in a while, I am sure it is fine. However, corns eat mostly mice in the wild and their system is designed for that. I was told to keep them on mice, as they tend to get fat(er) on rats.
I go by the Munson Feeding Chart for Corns, and that only shows mice.
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