I don't have a fumanchu (will likely be adding one in the future), but I do have a dwarf zebra lionfish. Their behaviour is very similar.
The only inhabitant I have had problems with is small peppermint shrimp, he ate them, but that was to be expected really, I ordered them not knowing what size they would come in at. We do have a cleaner shrimp that he ignores completely along with a Blue Jaw Trigger, 2 Bangaii Cardinals and an Blue Spotted Jawfish. No problems with anyone else, he pretty much minds his own business and ignores everyone else.
Ellie
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