It amazes me that there are so many questions about what works or doesn't works with prazipro. Again, why don't folks just call the customer service number on the bottle? They have done the research and testing on the product!!!
They will tell you all you need to know about the product and the ins and outs of treating fish with flukes. At least the gentelman that I talked to did, very nice guy. He even advise doing fresh water dips first.
When done properly, fw dips are not as stressful to the fish as the owner. Read about fw dips at wetwebmedia, if you can't find them he at RC.
A simple phone call can save you time, money, and the fish you care so much about.
By no means am I an expert, so I call on the folks that are ones.