I’ve had a filefish nip at my lps but strangely the captive bred ones were the ones that did so. I had a wild one a few years ago and he didn’t touch anything but aiptasia but he passed on me when I upgraded to a bigger tank now I’m looking for a new one hopefully one that’ll eat the dreadful majanos
I have only had problems with the files eating fleshy LPS and clams. I have never seen one eat aptasia or majanos but when I put the file fish in the tank the anemones go away.
My copperband is doing a pretty good job on the aiptasia in my tank. I’ve only had him a couple of weeks and he’s knocked them back considerably.
They aren’t easy to QT, though. I gave up after a couple of tries and ordered mine from humblefish fully QT’d (and pre-trained to eat frozen from your hand lol) but, he’s not taking new orders at the moment unfortunately.