Ich can come in on anything.....water, frags, macros, cleaners, fish, rock, substrate.....anything that goes in the tank. I'm sure you know that tangs are among the most susceptible as well. If they are eating and acting normally (except maybe the scratching) then I'd say feed at least garlic (you can add the focus/metronidazole cocktail as well) and monitor. If they act very afffected or stop eating, I'd suggest medicated QT. Sorry you're going through this, HTH
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