I have a Fish Only-Live Rock 120 gal aquarium which only one of my
tangs show signs of white spots. 3 weeks ago I started to lower the
Salinity to 1.009.

After carfully lowering the salinity to 1.009 so that there was no
shock to the fish, I got it lowered to 1.009. Now that the salinity
has been lowered for two weeks it looked as if the ich problem was on
the road to recovery, untill today I noticed even more white spots.
Has anyone ever used this treatment? I know it should take 6-8 weeks
but why all of a sudden another out break? I thought I was on the
right road to this type of treatment. What can I expect next?

What may have happened?

Rick