Only thing I can say is dont have Small fish in with them, dont have any Topwater fish that it may want to eat. Last wolf I had started fighting with a SH I had gotten from a friend. An pretty much just keep him fed so hes not hungry.
I had a 19" wolffish a few years back that killed himself. I came in one day to find the weighted glass canopy of the aquarium shattered and the wolffish with a crushed head and blood flowing out of its gills. Big wolves have the ability to kill themselves with their own brute power, so keep that in mind when setting up their tank.
I had a wolf fish for five years, mean as hell, and when he wasnt killing something he was hiding, finally pawned it off on someone in exchange for a big pleco for the pond, on the other hand he was a cool looking fish!
i have had one for a few months now its about 7'' i never see it eat its very timid but has good color never fights i am kind of dissapointed i thought it wold be a hellion