I bet it's flukes scoop then out and run prazio pro , super common with wrasse specially wild caught ones to have flukes , I usually do it prophylactic in the tank transfer before adding but it works just as good to qt them and treat with that
Google flukes see if that's what I looks like
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Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC, QT everything
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