My betta has been suffering from what I thought was fin rot for a long time, progressively getting worse. Then, all of a sudden, today he dropped two full pieces of his fins (entire pie sliver chunks as shown in pictures).
I just started medication treatment for fin rot as I thought this was the issue (and had been changing water for weeks prior), but I am now worried it could be fin biting, am I right? Or is it something getting caught in the tank?
Please advise me, thank you so much!