I use fresh garlic, crushed on the nori to soak up all the oil. As for QT, my personal opinion is this can often cause additional stress for a fish already stressed. Any new Tang I get goes directly into my tank to give it as close to a natural environment as possible. The only tang I've lost was a powder blue that wasn't eating, and it never started.
I just added a new PB last week (known to be eating) and it's doing great. No ich, no stress and lots of eating.
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Brad
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