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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,

Thanks!

Chris
 

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can you give us a better picture of what is going on in your tank as far as water parameters?ph,ammo,no2,no3?is light duration on a regular schedule?have you added anything new to the tank recently?has this fish shown any signs of stress or breeding behavior?
 
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