I understand this to refer mostly to young, growing BPs. Once they approach full adult size, they keep growing, but at a much slower rate, so you do not need to continue to increase the size of their prey.
They do not "need" to be fed weekly, but I think it is a good practice. People have had success feedly every other week or even less than that. However, I've seen enough people that I trust recommend that smaller and more frequent meals seem to work better, so I plan to continue to feed once a week.
I believe the small rats would be fine. If you find it isn't enough, you could always offer a second prey item.






