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Yeah, sadly some of the longer finned betta get in the bad habit of fin biting. Almost anything could be triggering it, which makes it hard to get them to stop, and then they get fin rot on top of it all. You'll probably have to keep an eye on this for the rest of his life...

If it was just a one time event or if it looks to be spreading, fin rot (bloody edges) can be treated with Kanaplex (kanamycin). With repeat offenders, things get tricky since you don't want long-term expose to antibiotics.

To deal with the fin rot, I'd suggest getting some tannins in the water by adding either dried indian almond leaves or organic rooiboos teabags. Tannins are naturally antibiotic and can be used long term but it will stain the water a light brown color.

To deal with the cause of the fin biting, well...
 
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