Tang's not eating nori?

Hi treated my tank with praziquantel yesterday for flukes. Tang's have not been eating nori or pellets for a few days. They will eat frozen. Finished a dose of 30 days in CP 4 days ago and did massive water changes and ran charcoal before I added praziquantel. No scratching just see flukes on a couple of fishs eyes. How long should it take before the praziquantel should work? Happy holidays. Tom
 
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