Did you monitor and/or treat for ammonia spike when you first brought them
in, or was the filter already cycled with previous fish?

The black could be ammonia burnt tissue. Since a month has gone by you've
already pass the point of easing the fish thru the filter cycling points.
Test the water for ammonia and nitrite. If no ammonia, do a 20% water
change, at least twice a month. If some nitrite is showing, add salt to
0.1%. ~ jan


On 12 Nov 2004 21:47:41 -0800, (Karen) wrote:

A month ago, I brought my two shubunkin goldfish in from my outdoor
pond, and installed them in a 10 gallon fish tank. (The fish are
about 2-1/2 inches long and looked *much* smaller outside!) Aside
from looking like giants in the tank, they seemed very happy and have
been doing fine. A couple of weeks ago, I noticed that some of the
scales along the top and back of one of them were looking black. The
black discoloration has spread and grown more pronounced since then,
and there are black areas on the edges of his fins now too. He is
eating and swimming and acting just fine, but I am worried sick about
him. Today I noticed that the other one now has a patch of black on
the fringe of his top fin too. I have spent days surfing the net
searching for a clue to what ails them, and how to fix it, but no
luck. Does anyone have any idea? I am very attached to these
adorable fish-children that had the good grace to live through my
first summer of pond-keeping!
Thank you --
Karen

~Power to the Porg, Flow On!~


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