Don't be sorry, it wasn't your English that made me assume your age it was the fact that you weren't taking the initiative to get the animal food.
Honestly, you sound like me when I was your age and if that's the case arguing with you won't solve anything. I understand the way you interpret the 6 months thing is it's ok for you to miss a few feedings without harming your animal which is probably true, but just think, you could survive a few days without any food or water right? Does that mean you should only eat/drink every 2-3 days?
I'll let someone else comment on whether 2 mice or one rat is better because I'm not sure.
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