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What does it mean when the betta's tail fin starts to get a black edge to it? I just noticed that mine has a tiny area on his that looks like it's black.
 

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Potentially, fin rot. Test your water for ammonia, nitrites and nitrates. That is generally the cause of fin rot. I would suggest a 25-50% water change regardless and boosting the temperature to 82 for a week. It may help and it certainly won't hurt. :)
 
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