Yeah...tangs and puffers. They get ick, or at least they get white spots alot anyway.

whatever you do , do not use copper with puffers

How bad is he? oh I mean she...this is martha stewart right? anyway hypo is the best way with puffers, just do it gradually. Puffers can tolerate near freshwater conditions...just bring it down to 1.009 and keep it there for a month.