Are fluffy growths that affect the skin, fins and any wounds on the goldfish's skin. Fungus is normally a secondary infection that infects wounds. You will not find any cases of fungus in a tank with good water quality. We also cover this topic in greater deal on another page fungus disease as it is such a common ailment.
If you see that your goldfish has fungus, improve the conditions of the water and buy standard anti-fungal medication like methylene blue. Act quickly. Fexibacter or 'cotton-wool disease' looks very similar but is actually caused by bacteria and requires a whole different treatment.
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