Not sure what this is anyone???

  • We are currently upgrading MFK. thanks! -neo
It is similar to the common cold to humans. There is nothing you can do but separate the fish and hope its immune system can fight off the infection in a few weeks. It is contagious to other fish.
 
is it just on the pectoral fins? any new fish in the tank? I have had some wild caught fish with parasitic lesions very similar to them that went away with time. not sure where yours would pick it up
 
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