Fighting Wounds or something else?

[naesco]

Brad I have never used the hypo-salinity method to treat ich.

But it appears to me that the purpose of a quaratine tank (QT) is the place a newly purchased fish in it and observe it. If ich, fungus or a bacteria infection is seen, a reefer can decide on an appropriate treatment.

I don't see why someone would put a fish through the risk and stress of hypo salinity unless it was necessary.
Is this what everyone is doing?
Wayne