Our expert says:
I am not a vet!! I work with people only - but I love goldfish, so you can either turn up the temperature of the fishtank to 27 degrees C , add coarse salt to the water or ask your petshop for malachite green containing medicine to put in the water. Hope you get rid of the parasite - it can be very persistent!
see also http://www.animalforum.com/fich.htm
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