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Identifying growth on fin

Subject: Identifying growth on fin
by snowy_owl on 13/8/2020 11:37:52

I moved my two 14 year old goldfish into a new 180 litre aquarium last week, ensuring that the majority of the original water was moved into the new tank. Last weekend I noticed some growths on the front fin of one of the goldfish (see photo). Does anyone know what it is and how to treat it?

The goldfish is not bothered by the growths (it is still eating and swimming normally). The KH and nitrite readings are normal. I have just completed a 5 day course of myzaxin, as suggested by my local aquarium shop, but it has not made a difference.

Any advice greatly appreciated. Thank you.