Abnormal swimming behavior

PicaGaG

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Please help me.
English isn't my first language, I used a translator for these messages, so they might not be entirely accurate.


Since yesterday, my flagfin has been swimming rapidly back and forth along the sides of the tank. My initial thought was that it could be parasites or overstress.

I gave it a freshwater dip and ruled out Neobenedenia. What could be the cause?
I hope the video uploaded correctly.



 

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