There are only a few cases that I personally, and many much more advanced hobbyists have seen, in which a blue spotted filefish was kept alive and healthy longterm. They do best in the public aquarium setting, with HUGE amounts of acropora colonies. They seem to be very very picky at what sps specimens they will eat, and in home aquaria generally will kill acro colonies from disturbing them too much, and likewise destroy their food source and starve. 20,000 gallon habitats with endless options of sps colonies will keep these guys alive and well, a home tank will not support them long term unless you keep buying tons of new fresh acro colonies to cycle into the tank when the polyps stop extending on the last colonies.