I've uploaded the photo's but they are between 317kb and 334kb.

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That is one BIG goldfish! Did you report your water parameters?

If there isn't a problem with those, perhaps like koi, black can come and
go. I know pH alone can cause black freckles in koi, or make a black &
white Bekko go all white or become all black. (Not personal experience just
what I've heard.) Otherwise, the black, to me, looks like coloring, not a
skin problem. ~ jan


See my ponds and filter design:
www.jjspond.us

~Keep 'em Wet!~
Tri-Cities WA Zone 7a
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