Well, another thing to consider would be copper sensitivity. It's not generally common in tangs, but it happens. Even if you don't have the rally, you might try moving him to a bucket or another QT without medication and see if he perks up there. I'm sorry, it's tough to diagnose when there are no visible symptoms.
@Humblefish @melypr1985 any other ideas??
@Humblefish @melypr1985 any other ideas??


