Is this turbellaria ("Black Ich")

[Redland]

I noticed this in my Pearly Jawfish list night. Dosed the tank with PraziPro, still there today but seems to have moved. THe fish had just completed tank transfer method with an atlantic yellow tang but had not been dosed with any meds.
If it is turbellaria, how long should I expect to see if after dosing PraziPro? If not, what is it?