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Discussion Starter · #1 ·
I have 4 blood red parrot fish in a 50 gal fresh water tank. A month or so ago one of them started to show streaks of black on her tail. I was wondering what this was and how I can treat it? The tank and fish are over two years old. I do a 1/3 to 1/2 water change every two to three weeks and keep the temp of the water at 80F.

I have attached a picture.

Any help is appreciated,




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