is this a problem??

I have just started with goldfish because my daughter won one at a
local fair. We have it alone in a 10 gallon tank which is cleaned
daily and water exchanged every week. It is very clean and the fish
seems to be doing well. The last few days the goldfish has developed
a black coloration along the top edge of the top fin. Is this
anything to worry about?? If so, what does it mean and what should we
do?? Thanks for your help.


Mark,
Both of mine had that happen when they changed colors. Mine were brown and
the black ran accross the top of them and then disapeared and then they were
gold.

Kay