probably b/c your posts are confusing as hell.
I'm not really sure what you said to be quite honest, but I think you wanna know rat sizes? Try checkin out weaned rats, my yearlings are on them.
But use your head, that's the best guide for things (unless you can't judge size for you life) but you know how big your critters are, so do what you think is best
btw, pretty snakes