Guppy with clamped tail fin

[brennae]

Anyone know what causes this? Only one fish has a clamped tail. Should I isolate? I tried looking online and found nothing helpful. Unfortunately it's one of my half black yellows that's I've had a week.

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[Matt68005]

Lots of things can cause clamping. If water quality is good, just keep an eye on it...

 

[brennae]

So far no other sick fish in that tank. She is still eating and swimming around with that clamped tail


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