So you are feeding fuzzy mice to a BP?
First Fuzzy are way to small that's colubrid food not BP food, BP are started on hopper right out of the egg.
You also do not attempt to feed hours after it fails you wait another week.
You are a first time owner with what I will assume an hatchling so know that before switching you must make sure that they eat for you successfully at least 3 to 5 times unless of course you bought the animal as F/T feeder which means at least 5 meals on F/T from the breeder.
In any case do this to a T https://ball-pythons.net/forums/show...-hatchling-101