Blue tang with ich

I just recently did an upgrade with my tank. My clowns and goby made it nicely over but my tang did not. Hard to get a good picture and this is his good side. Bunch of white dots. The skin looks raised around the dots. No other fish have this. Show to my fish store. Said To use copper. Said dose 40 drops per day for four days and keep the fish in there for two weeks. Everything I read here seems to be different. Wanna clarify how long and how much? Do I need a test kit?

FWIW, my Blue started showing the signs of marine ick. I immediately started a couple day regimen of frozen food mixed with Metroplex. It was gone within a week.
 
FWIW, my Blue started showing the signs of marine ick. I immediately started a couple day regimen of frozen food mixed with Metroplex. It was gone within a week.

Seachem's website states that metro treats parasites but I have never had any luck with it. I would credit this to the lifecycle of ich.
 
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