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

Thanks for that Ingrid. That explains a lot. That's why the bucket load of fungicide I put in the pond did nothing. The pond had a big clean out a couple of months ago and I use a couple of brick to raise the statue. They are out now. This probably stressed the fish making them more suceptable to the disease. I've got the PH down to around 7 and I'm testing it every day to check for any change.

The puregold site said the treatment for columnairs is potassium permanganate in the water but I'm a little unsure about the exact method of use. Is it a crystal that is mixed with water to form a solution? What is the ratio for the solution? Do I take the fish out and treat them in a hospital tank or do I put it in the pond which is 1600 litres. Does it then have to be remove from the water after the treatment by using hydrogen peroxide and what ratio? Will it kill the plants snails and mussles? It also said don't use potassium permanganate if the PH is too high. What is the safe level.

Thanks again,
Kim