Juz to share...
for me, i add a couple cleaner shrimp.
I have three tangs. Regal, Brown, Yellow Tang in my 4 ft.
Initially, the brown tang has white spot. I caught it. Dip it in fresh water twice a day. In 3 days, the spots are gone. The fish is very healthy now.
ONe more thing, if the fish does not die of white spot, it will be stronger and resistant to the disease.
Garlic is a good preventive measure IMO.