black edging on tails and fins
Is black bordering of the tails and fins natural, or is it some fungus or something? My friend said that her goldfish's black at the tips of the fins and tails started spreading, until he died. She thought it was just a coloration, and she still doesn't know if his death is unrelated and coincidental or not, but now I'm paranoid. My white ryukin has a bit of an infection on his tail (white and jagged) but he also has black on his tail/fins as well. And he never had any black on his tail.
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