Yeah after my clown died, the other clown got 2 days to live then he die too. In the freshwater dip, dip it in that after you do a treatment dip. Watch the fish for 30-60mins until it starts to sink or shows signes of disstress. ALSO look up " Help my CLown fish's face is chapped" my old forum because there is better advice..
and put a poly filter pad in the QT, it will take out all the left over medication and extra organic materials. Good luck