how to know when to switch to rats

when i got my new bp the lady told me to feed it two adult mice. so the day i got it i fed it one just because it looked so weak. and well i am going to feed it again in a week and just wondering if i could transition to a smaller rat, one that properly fits her size. In stead of two adult mice.

If she'll make the switch, and the rat feeder is the correct size for your BP, then I see no problem with you giving it a try. Personaly, I would get back to feed an what ever she'll eat, then try to make the switch.