It looks like it has a bit of damage to its caudal area. I see some white spots, but they are not clear enough to say if it is ich or not.
Three things commonly cause white spots on hepatus tangs; ich, coral sand sticking to the fish and mucus plugs. It is not always easy to tell these apart.
What I look for with ich are small white spots that come and go, and change location over a period of a day or two. The spots may go completely away, then return in different locations (including the fins). There will be a general trend though, pf the spots increasing in umber.
Coral sand shows up, but then gets brushed off by the fish in a few hours.
Mucus plugs are a reaction that hepatus tangs show to some skin irritation (but this can include ich!). They are larger, and tend to remain in the same location for days at a time and really do not come and go.
Jay
