One of my koi fish have a white cyst above its eye. What is it and how do I treat it?

The cyst is rather full-size, about a quarter inch on a six inch fish. None of the others hold anything like it. There are give or take a few 30 fish living in a small space, four life-size ones (nearly a foot) and the rest between four and six inches.


Answers:    go buy some treatment for fish ,put some of that within the tank when you stimulate it the fish will get it's color backin 1 or 2 weeks
that's call ick it is a bad fish disease receive it help soon

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