I'm confused, I thought Prazipro was the treatment for Flukes? But you're saying it will only help if it's in the gills? How do we know where it is and what is a more suitable treatment?
I've never had a fish with any kind of parasites etc. before (8yrs strong

) Now I have 2 tangs, going on 10 days now. The yellow was flashing, the Kole has been normal, so I did the freshwater dip and sure enough, Flukes! A video someone posted on this site was super helpful in identifying the Flukes as well as your instructions on how to do the FW dip! Thank you for that! I'm new to having a fish with this type of illness...any illness really. Anyway, I dipped the Yellow Tang, the Kole tang went into hiding for about 5 hours, he's small and was hiding way up behind the HOB filter, so he didn't get a dip...but he also has not been acting like anything is bothering him. So I treated the tank with Prazipro as directed on the bottle, adding 1 TSP to the 20g QT. Yellow tank hasn't been flashing again, he did shake a bit...like a dog shaking off water I guess is the best way to explain it. The QT is in the room I'm in most of the time, so I can watch them the majority of the day and night.
Anyway, Is this going to kill the Flukes in the tank and on the fish? Do I do a water change in a week and repeat the medication? and how many times do I do that, how do I know it's time to stop treating?
Thank you!