if its just that one fish and that one spot it could be flukes or it could be a bite from another fish ? any aggressive fish toward it>? need a better picture to confirm google some picture os fish disease and compare

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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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