Wrasse biting own tail fin

Wow, I thought I had seen plenty in this new hobby. Until today. My Christmas Wrasse is going in circles biting his own tail fin. To make matters worse, my DT went fallow for 6 weeks while new fish were in QT to clear any marine velvet. The wrasse came in with fin rot which I treated. Now this. Sure hope I don't have some other parasite lurking in the weeds...

Any ideas? I doubt he likes the taste of his own tail...

Thanks.
 
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