The very first thing to do is to check your water quality. What are your
ammonia, nitrite , nitrate and PH levels?
Also what size tank are the fish in? Should be pretty big if you have 15
goldfish in it! Once we establish this then we can help you further.
Mel.


"ab" wrote in message
. ..
Can anyone diagnose what is exactly wrong with one of our goldfish.

1 of our 15 fish is showing some wierd behaviour. About 2
months ago it turned completely silver ( took around a fortnight to
happen) ...
the fish was pale orange to begin.
Although it's feeding normally, with the others & swimming just as fast,
with
them, it appears to have lost all sense of co-ordination, swimming /
flipping
around in circles & swimming upside down sometimes. My wife suggested
that
it may be *blind* ( ?? ) .... but, it reacts to movement outside the
tank, just like
the others.

Any ideas ?