If you are asking about the orange spot filefish here you are not ready for one. They are for sure, on the list of fish, that should be left in the ocean, by all but true Experts. Most professional aquarists cannot keep them alive. They are obligate corallivores, subsisting near exclusively on acropora slime. Success generally is in either massive SPS tanks with sufficient growth to satiate their appetites, or in 50-70gal tanks with feeding 10+ times a day. A few expert hobbyists have claimed to crack the code on keeping them in these smaller tanks and training them to subsist on typical aquarium fares. The most credible of these hobbyists refuse to share their secrets as to prevent inexperienced people driving up the demand on these expert fish.
This is really only a fish for the kind of aquarist who has many years of experience and confidence with the classic "Do Not Buy Fish" and after years of success and research really wants to try to push the envelope.
The information, on how to successfully keep these fish, is out there, it isn't hard to find if you know how to look. I am not particularly interested in these fish and I stumbled across it unintentionally a couple years ago. I would recommend anyone seriously interested in these fish, researching the people who had the first captive breeding success, with the two (sub?)species the long nose and short nose. Though the endeavor of simply keeping them alive should only be undertaken by those well prepared.