Prazi will also hit internal parasites, so it's often advisable to treat with prazi anyways.
What you might want to consider (now and in the future) is that many fish will stop eating for a while after prazi. So you may want to get the new fish eating first, before you treat with prazi if the infestation with flukes isn't too bad. With my incoming fish, I try to get them eating my foods first and then after about a week or so, then I'll give them a prazi treatment.
Also, if you're up for trying it, a freshwater dip of 5 - 10 minutes will kill most external parasites, including flukes. This can be 'gentler' - I did this with a Potter's angelfish instead of an initial prazi treatment since it wasn't eating well yet. Just make sure to match your tank temp and pH and aerate well when doing the dip and keep and eye on the fish during the whole dip, and remove the fish if it's showing signs of a lot of stress.
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