Yellow Tang with Black Spot disease

[PFisher]

Have you concidered Hyposalinity? Much less stressful for the fish and from what I have heard and read is one of the most effective meathods of erradicating ick (have not had to deal with ick myself). If you FW dip, the ick on the tang will die, but what about the stuff still in the tank when you put him back in? Just my two cents.