A general rule of thumb is to feed 10%-15% of your BP's body weight. That would put you at a feeder of roughly 30-45 grams, which should be about right for weaned rats.
Your BP looks great!
Let him settle for a week or two before feeding and don't handle him until after he's had 2-3 successful feeds for you. This is a species very prone to stress fasts, so give him plenty of time to get accustomed to his new environment and solidly feeding before you handle too much. Then make handling sessions short and positive, 10-15 minutes to start.
Another critical key to a happy ball is husbandry. How's your setup? Be descriptive and we can help you dial that in to a T as well. Improper husbandry is the #1 mistake newbies make, so we can save you a lot of stress by getting that straight from the get-go.
Welcome to the forum!
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