Is that a certain type of filefish? Do you have a pic?
I think a lot of LFS have been selling the matted filefish as the aiptasia eating filefish. It's really hit or miss. The last time I tried one, it swam by a rock with 3-4 aiptasia on it daily and never ate them. It did, however, devour a good assortment of zoas before I realized it was the one doing it.
Yeah I'm pretty sure it's just a matted filefish. He's pretty good at changing colors and turning green when hanging around my vast algae beds but he has never touched any of my zoas, and I have 4 different zoa colonies. Just like some fish that nip corals, it's probably hit or miss
Okay, thanks!