How to dose 2nd round of prazipro?

Do a water change then dose as directed. You can wait 5-7 days after the initial dose. If the fish do have flukes and they handled the Prazi well then I would wait the 5 days.
 
do you mean do a water change and dose for 5-7 days, then do a water change again and dose for another 5-7 days?
is it a reason that I should wait a few days between the 1st and 2nd dose?
 
do you mean do a water change and dose for 5-7 days, then do a water change again and dose for another 5-7 days?
is it a reason that I should wait a few days between the 1st and 2nd dose?

yes, the reason relates to the life cycle of the fluke. PP will not kill the eggs; so the first round only kills all the adults, then the 2nd round will kill the hatchlings. You need to give the eggs time to hatch, hence the 5-7 days. Adults won't lay eggs again for another few weeks, so there is no risk of a 2nd round of eggs being laid.
 
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