Why Is My Goldfish Turning Black?

Answer

The reasons a goldfish turns black could be due to too much ammonia in the water or over feeding. It can also be due to overcrowding of the gold fish in a tank that is too small. By correcting these things, the fish can turn back to gold.
Q&A Related to "Why Is My Goldfish Turning Black"
The blackening of your fish's tail is most likely an ammonia burn. Do a large water change and cut back feeding to 2-3 times a week until the ammonia levels go down.
http://wiki.answers.com/Q/Why_is_my_goldfishes_tai...
Goldfish have several different types of skin cell that determine the coloration of the fish. Those present in black coloration are called melanophores and they contain melanin, a
http://www.ehow.com/info_8785278_do-goldfishs-fins...
If it is just black spots, your fish is probably healing from ammonia burn. They
http://www.chacha.com/question/why-did-my-gold-fis...
Not Medical Advice: If a goldfish is turning black, it can be an indication of a scar tissue from toxins in the water such as ammonia or nitrite.
http://www.kgbanswers.com/why-are-my-goldfish-turn...
1 Additional Answer
Chances are your goldfish is turning black due to a chemical burn. Check your water chemical levels. Usually turning black indicates too much ammonia in the water. You can find more information here: http://thegab.org/Illness-and-Treatment/what-is-wrong-with-my-fish.html#BlackSpot
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