Yeah. . . I have a mimic file in my display with SPS, LPS, and a few softies. CUC is hermits, snails, emeralds, and a pitho crab.
It is possible the file nips at corals, but if so I have never witnessed it personally. Regardless my corals seem to be growing just fine. The file dose bite onto an acro at night to sleep, in particular he likes my "trash compactor" millipora from @Battlecorals, but the coral does not seem to mind.