I start my hatchlings on live hoppers because I have a near 100% success rate with it but I transition to f/t asap and all my collection eats f/t. So some breeders do f/t, most don't because with a large amount of animals live is easier. I only have around 100 animals and it is a pretty big ordeal feeding everybody f/t but I still prefer it. A lot of people do appreciate my effort and are happy to get a hatchling already eating f/t rat pups consistently so it works for me but I definitely understand why most breeders feed live. If you want to get a hatchling on f/t already, it's possible you just have many less options so depending on what morph you want, it may take a while to find what you're looking for on f/t. I would not recommend getting a hatchling on live and then trying to convert it. If you know you want to feed f/t, buy one that is already on f/t. Good luck.