I would up the size. You should be feeding almost 20 grams. I know most hoppers I got were only about 9 grams.
I know I was under feeding mine until I found this site I was giving mine small adults and they were about 250grams I have since up it to med to large and are taking between a 20 and 30 grams every Friday. They have gained a little over 50 grams in about a month. I am weighing them about every 2 weeks and weighing the mice every week to make sure I am giving them the proper size.
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