Does my dwarf gourami have a fungus infection?
Male red gourami - around tail and end of body has developed a discolouration, best described as mouldy looking. Fish seems ok - alert and eating properly.
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Yes, fungus could very well be described as mouldy looking.
Fungus is generally secondary to an injury of some sort.
An antibacterial medication would be the best course of action. In North America I would suggest Fungus Clear (by Jungle). I am not sure what you have available there.
(Guessing from spellings of a few words you are in the UK)
The water might need to be treated, the ph levels might be off.