I didn't have luck with Hypo with my Powder Brown tang. After 8 weeks in Hypo, 1.009 - 1.008, the ich was no better, and maybe even worse. At this point I went with a combination Hypo and RidIch (Formaline and Malchite Green) and this finally did the trick. (I wanted to use copper only as a last resort) 4 more weeks and the fish went in to the display.
The moral of the story is, some people have great luck with Hypo only, and some need a little more...
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