All the tangs like Powder Browns, Powder Blue, Regal Blue & Achilles are terrible ick-magnet fish. Even if yours survives this bout of ick, it'll continue to persist in your untreated reef. With ick-magnet fish, any stressor, such as adding a new fish, will cause a fresh outbreak. When you see almost no white specks that just means the parasites have undergone another life stage and a day or two later, they'll most likely be back but even worse. The white spots are pregnant parasites forming on the surface of the fish so when the spots disappear, the ick is in its free swimming stage or has formed cysts that land in your substrate.
Hyposalinity and copper will kill the parasites, BUT NOT in your reef display tank. Needs multiple weeks of treatment to be effective. Cleaner fish & cleaner shrimp also do NOT eat ick.
This marine parasite tends to attack the fish's gills the most, which is why the worst infected fish tend to breathe rapidly and then die after a few days.
I HATE Marine Ick & Marine Velvet with a passion.
Good luck.
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