i had a wolf fish that was kept with and grew up with numerous s.a. cichlids, needless to say he is a big baby.....but in your case, for sure your discus would be eaten up....
it would wreak the discus' day and probliby yours....but on the other hand the wolf fish would be having a GREAT day...i also want a wolf fish but i don't think it would go well in any of my tanks.