Actually, fuzzies have one of the smaller mouths of the lionfish family. As long as the size differential between the fuzzy and any potential prey item is proper, there should be no trouble. However, most of the smaller shrimp, such as peppermints will become tasty treats. The shape of a tankmate is also important, as longer, slender fish are more easily swallowed than a taller fish of the same length.
IME, hermits are safe as long as they remain in their shells. We even keep a couple of scarlets in our adult volitans setup.
FWIW, we keep 2 species of dwarf lions (a fuzzy and a barberi) in a std. 60 gal along with a trio of blotched anthias, two small species scorpionfish (Scorpaenodes littoralis and S. caribbaeus), a red-finned waspfish, and a cockatoo waspfish + a CUC of assorted snails and a few scarlet reef hermits.