Umm, Fish?
Bill has it spot on. Recently, there have been some reports of these filefish switching over to prepared foods, but I feel that this does a great disservice to the typical home aquarists who read that, and hoping against hope, buy one of these - only to have the same result as we did 30 years ago - they wither and die.
Why is this? Multiple reasons; savy aquarists can preferentially acquire fish from better sources, and are better prepared to meet their specific needs. There are also cases online of people reporting they did well to save face, but in reality, their fish also died (Obviously, not talking about Matt, et-al here).
The "rank and file" should not rely on the few reports of certain fish doing well - they probably cannot replicate those results. If you can get one from a region other than the Philippines or Indonesia, and you can get it in your SPS tank ASAP, you might also have moderate success....if you have all your other ducks in a row!
In my 40+ year history, I've seen hundreds of these fish go through the supply chain and just die. The ONLY two that I personally had success with, was recently, with ones where I bypassed my normal quarantine protocol, and moved them directly into a SPS tank. They did just fine there. Fat and sassy, when I moved them out (because they were eating too many corals), they also withered and died. If I had spent many hours with them individually, I may have been able to get them to convert their food type, but I just couldn't afford the time to do that. Therefore, this species is still on my definitive "do not acquire" list.
Jay