white powdery mildew is columnaris, a bacteria.
it sounds like something has been dumped into the pond, like slaked lime, or maybe
somebody tossed in a lump of plaster of paris, or a plaster of paris statue, or maybe
marble chips around it and it rained and leached it into the pond. or some kind of
fresh concrete statue or bricks under pots. or ????
Ingrid

KMJ wrote:

Thank for the advice and the pointer to the Puregold website.
Unfortunately I got to him too late and he died as well as 2 more fish
in the pond. It's been a steep learning curve but I'm really getting
into it now. I tested the PH in the pond water and it was around 9.
I've managed to get it down to around 7.2 over the last few days and
the other fish seem OK so far except a few have what looks like a white
powdery mildew. Now I've got to figure out what this is fungus or
bacteria and what made the 7 year old pond become so alkaline.

Cheers KMJ



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