You don't have to feed f/t. I've heard some snakes will refuse f/t. I feed f/t because it's easier on me. I don't have to go to the store every week to buy live or keep mice/rats alive for weeks.
It's really a personal choice, but I think overall f/t is safer for various reason include possible injury to the snake and parasites.
Good luck with whatever you decide to do.
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