Like Hannah said, check the husbandry first. Don't stress if they miss a couple meals, try not to resort to live because they may not go back to f/t. And hoppers are fine, they can take hoppers right out of the egg. My 3 month girl has taken 2 rat pups in one meal, she'd easily take a small adult mouse. They can eat way bigger prey items than you'd think to look at them. Under that fuzz, mice aren't as big as they seem.