Is this internal parasite?

[ianryd]

New Pintail wrasse in QT currently being treated with prazipro. Saw this white stringy poo today. Is this a sign of internal parasite? Sorry the pic sucks, I cant seem to upload a video from my phone View attachment 15595

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[ianryd]

I should add that this is the second round of prazi. I got the fish on oct 6

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[Andrew_bram]

I feed hex shield it seems to work very well.

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