White looking fungas on around 10 fish

[j.w]

Thank you I will order the aquaprazzi, and see how it goes ! The fish what have the fungus on them were born in the pond and are about 6 inches long , they haven’t spawned . The filter box , I can’t remember how many litres it can handle but it was way over the size of the pond , I am still awaiting kit to test water but thanks for the input !

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