ANSWERS: 2
  • the materials in the food u feed it will turn your gold fish's mouth black an it's face
  • Goldfish are highly inbred creatures, and humans have been breeding them for color and fin variations for centuries. It sounds like your goldfish is merely undergoing a pigment change. The ancestor of the goldfish, believe it or not, is a drab, darkish olive fish, not the bright orange fish you see today. Goldfish pigmentation can undergo great changes, depending on diet, the amount of light in the aquarium, or just simple maturation and growth. Sometimes a goldfish can turn smoky black all over, and quite rapidly too. As long as your fish is active and eats normally, I wouldn't be worried.

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