I am not a fan of medications in DT. In term of prazipro, it is mostly reef safe but it will most likely kill your featherdusters, worms (bristleworms etc).
Also prazipro may suppress appetite of your fish a little. I would just continue with the treatment if that's the case. The appetite will come back after PP is removed.
The best protocol for PP treatment is 5 days on, 5 days off and 5 days on again. The 2nd treatment is to kill 2nd generation parasites. PP can't kill eggs.
The parasite most likely is with your fish all the time. It's impossible that the parasite comes with the frozen food as someone suggested.
Good luck.
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