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Why is my goldfish's tail drooping?

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I've had my goldfish for about 2 1/2 years. I think he is a faintail, but may be a comet (unless they are the same, I don't know!). A few days ago, his tail starting drooping and I don't know what is causing it. The pH is fine and I treated the water for chlorine and ammonia, so what can be causing it?!?!