bro just to share with you I reef by one principle if it does not eat don't buy..than again if you think you can make it feed by all means you get it..
My YT who my Mom named Kiko is now 7years old he never ate anything for 4weeks only grazing on algae in the tank but after awhile it ate now he has transformed into a pig tangs will become accustom to your food... tangs are easy to get feeding maybe hard also are those species like PBT,Blue tangs etc..complete different story if get one that is not healthy at all
Very sorry for your loss
Cheers!