I don't disagree. I have also never seen leaving them in a quasi-hypo solution for 10 days untreated (as one dies and one by all indications is getting much worse) work either. The refrac isn't due in till the 10th, going from 012 to 'normal' to use copper does not seem all that healthy either.
To me the options seemed to be; do nothing or something as it appeared the condition was worsening.
someone could say that FW
dip "didn't work" because the fish died. Perhaps in reality, the FW
dip is killing off the parasite - just not quick enough for that particular fish.