SORRY! I was out of cell service all day.
Anyways, this is not the filefish that I'm currently looking for. However, I just returned one of these little monsters to the LFS. It nipped at all of my polyps and SPS. Left the LPS alone, but everything it munched on. I had it for a week and in that time it destroyed my Bali Green Slimer (about 4" frag) and ate a huge chunk out of my zoanthid colony.
They're hit or miss, but this guy left all my aiptasia alone and went right for the corals, I tried him in three different tanks, had the same problem in all three. They also can't handle even a semi-aggressive tank mate. My Coral Beauty just swam up to check him out and he panicked and tricked to get in the overflow box.
They're more commonly referred to as a Bristletail Filefish.