Rat too large by

I went to the store the other day and got a fuzzy rat, my understanding was this should be around 12-20 grams. I requested the smallest they had (10-15% of body weight). That’s not what I got, it was on the bigger end. I get it’s a range, so if I do one that may be bigger and then go smaller next feeding will I be okay? She got quite a bulge from eating the last so I know it was too big. Like a bone head I didn’t pull out my scale and weight the rat first. Any thoughts on how to better target feeding weights when dealing with the local pet store or am I overthinking things? I also have her new enclosure setup with humidity holding substrate, just wanted to get her settled and fed before moving her.

I went to the store the other day and got a fuzzy rat, my understanding was this should be around 12-20 grams. I requested the smallest they had (10-15% of body weight). That’s not what I got, it was on the bigger end. I get it’s a range, so if I do one that may be bigger and then go smaller next feeding will I be okay? She got quite a bulge from eating the last so I know it was too big. Like a bone head I didn’t pull out my scale and weight the rat first. Any thoughts on how to better target feeding weights when dealing with the local pet store or am I overthinking things? I also have her new enclosure setup with humidity holding substrate, just wanted to get her settled and fed before moving her.