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unidentified attachment on tail fin

Subject: unidentified attachment on tail fin
by Zendo on 2019/4/7 14:39:33

I have an elephant ear Betta with an unidentified attachment on tail fin.
He does not seem to behave any differently although I am aware that he rests quite a lot but that maybe that i have only just noticed this.
He is alone in a well planted 18litre tank.
I have attached a photo the black item is protrudig from dark spot on fin .