I only use that 10-15% rule for babies and even then, I more or less just wing it. Feed them stuff that leave a nice lump but doesn't make them look like they ate a football. My 1680g girl eats a medium rat every week. She sometimes refuses here and there but I got it covered as I have 3 garbage cans who will eagerly take it lol.
With that said, a 1200g male should be fine on a small rat weekly.
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