05-23-2010, 06:46 AM
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Are the black areas more like spots of black or patches? A picture would help.
Although it could be ammonia burns like Kelly stated, I would tend to think it would be more reddish/raw blotches/streaks rather than black if that were the case. From experience with handling Goldfish
, the black patches usually appear after an injury such as ammonia burn, pH change, rough handling etc... happen, and are in fact a sign of the fish healing and appear secondary to the injury.
What other tank mates are with the Goldfish
? And water parameter reading would help too.