Orangspotted Filefish should be left in the ocean. They eat the polyps of acropora corals only and they will die in an aquarium without a steady supply.
Other filefish are much better but be warned they grow fast and some will easily outgrow a 55. Plus they tend to be curious and even non-coralvores will pick at corals freshly introduced just to figure out what they are. I have kept several and they all showed this behavior. There is alot of info out there for files, just type the species name and hit search or read some of Scott Michael's books.
