Sorry but this is just not gonna work. First regarding the name a pup is considered at to be over 2 weeks old, the sizes you mentioned correspond to rat pink and fuzzy rats. Names do matter for the person that goes out to buy the feeder.Give it a live rat pup with its eyes still closed. Weigh the prey and pick one 9 to 12 grams
Whether you are dealing with non started or non thriving animals you want to offer mice, they are more enticing compare to rats, there is also an issue with the size you are recommending knowing that this animal has been reluctant to eat, the smallest hopper which are usually around 7 grams will be best in this case.
Advising a 15% to 20% percent feed for this type of issue is just not recommended, the animal has been reluctant to eat and is weaken so smaller is better.
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