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Normal for the water to be a bit cloudy or even foamy/bubbly when using Prazipro. No need for a wc quite yet but you can do one as soon as 72 hours. Wcs while using prazi need to be large before dosing again. It's effectiveness is not very long and treatment should be ongoing for atleast 3-4 weeks to end the life cycle (especially in cooler tanks).
It doesn't sound like your doing anything wrong! Just relax a bit, keep the water healthy and everyone will be just fine!