Fin rot?

  • We are currently upgrading MFK. thanks! -neo
It looks like bacterial fin rot. Stress and poor water quality usually the culprits. Easily treatable though (e.g., Melafix or APIs Fungus cure [which takes care of bacterial fin rot as well]). Probably better to move it to a hospital tank, especially if you use the API medication because it turns the water green.

HTH
 
Yeah, I've had one or two fish get bacterial fin rot even while others in the tank looked great. Stress weakens immune systems. All you can do is treat the problem and then see if you can reduce whatever might be causing the stress as best you can.
 
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