When I got my girl she was 67 grams and fed live mice, I am unsure of what size. I first tried a rat pup a couple days after getting her, she didn't take it. I really wasn't expecting her to though. Then I tried a live mouse hopper and she at it. She was fed live hoppers two more times, the last time off tongs. Next I gave her a live rat pup that was about the same size as the mice she was eating. She ate that, so the next feeding was another rat pup, live, from tongs. Since then she has been eating F/T rat pups from tongs for me with no issue at all. I did it slowly because I know that some BP can be really picking. And I really wanted her to eat rats because I breed them. I started with what she was already taking to get her eating. She is not about 150 grams or so. Maybe 160.