I just dosed my tank with prazi because I though it was possible he had flukes. He started swimming erradicly and flaring his gills. Within 15 minutes he was upside down on the bottom. I grabbed him and put him in a freshwater bath thinking maybe the flukes were quivering in his gills and killing him. This did nothing. Tried reviving him for 20 minutes but he was gone. What on earth happened.... he was a huge healthy active fish. I am heartbroken.