Fancy goldfish help

[ecadnac7]

This fish lays at the bottom but still try's to eat. Can't swim though. Has a cyst type mass protruding from behind body on tail. Been this way for a couple weeks. I've had him for a couple years and feel bad I can't help.

 

[IShallNtEatFish]

Could you post the tank and water parameters? Size, temp water changes? Amm nitrates, nitrites, ph?

 

[earlysteven]

I had a goldfish that had the same thing when I first began and exploded pretty much and all my other koi and goldfish followed hope some one can help you out soon

 

[ecadnac7]

I don't know all the parameters. It's a 37 gal tank. I change the water every 2wks.

 

[ecadnac7]

The mass has been there for months. I have had issues with this fish floating at the surface before but have been able to cure that only to have this problem now. ?

 

[earlysteven]

I would put him in a different tank and test your water

 

[ecadnac7]

Ok I will

 

[ecadnac7]

Ph 6
Nitrite 0.5-1
Nitrate 40

 

[MJSerik]

I'm assuming 0 a ammonia, and I'm guessing you know nitrites are bad.