Quarantine the white spot fish and do daily water changes
with treated water. You may also have to treat for Ich

I'd also do a regular water change on the non-affected fish
too, just to be safe.


"Trevor G. Cook" wrote:

I am new to goldfish keeping and would like some advice.I have 4 fish, 2
that are gold and white and 2 all gold, typical 'goldfish'. The largest all
gold one (3") has 3 areas on its tail fin that can only be described as
'white spots'. Each area is no bigger than 1/2 cm round and has several
pin-prick spots on it. I've treated the water with a solution intended for
fungus and white spot, but if anything, the areas are getting bigger. The
other all gold fish now has 3 pinprick spots on its tail fin. However, the
speckled fish are unaffected.
Any suggestions?