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Don't be so fast as to think it is ick,
Tangs in general will develop sand looking spots on their skin. Keep an eye on them, mostly this is caused by stress in one form or the other. If they get harrassed from other tank mates and just adjusting to the water quality can be one.
Be careful to not treat for ick when a may not be, I had a friend wipe out his tank because he treated for it and didn't need to.
My recommendation is to do water changes(small) on a frequent basis you'll be surprised what that alone can do
Just my $.02 BTW
Good Luck
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Romeo
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