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Disease Question

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My question:

If you buy a goldfish (comet) with black spots on the fins, and put them with goldfish that never had black marks (lived for years), and suddenly they get black spots on their fins + are bottom sitting, what kind of illness does this represent?

Doubtful that it is ammonia burns, as those are to do with water quality and not contagious.

Edited by ashihtaka
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if you could answer all the questions at the top of the page, that would be helpful. perhaps there's something wrong with your set up? black spots can be a sign of ill health, stress signs etc.. but they can also come from bacteria. ammonia is not the only cause for black spots. a few pics of these spots and/or a short video might also help.

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