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Pretty interesting stuff thanks JR. Sounds like you're saying, at worst, that I would only need to consider getting rid of affected koi and that the other koi should not be carriers, or at least not the non-red ones.
Interesting about nitrate level. Mine is is 10ppm.
GH is 6 degrees,
KH is 6 degrees,
PH is 7.8 usually
Ammonia is 0
Nitrite is 0
Should I be aiming for something lower than 10ppm nitrate?
Other info in case it might be relevant: my filter is a combination of vortex then 1000L settlement chamber containing netting to trap algae, K1 chamber, UV then trickle down hydroponic clay (above water level). I have also been using a large canna lily plant filter for years but have recently stopped as they create a large amount of sludge build up which is hard to clean without removing the large plants all the time. Pond water is turned over once every 4 hours (which I realise is a bit slow).
I'd like to try the KH manipulation in warm water, presumably using hydrochloric acid to bring it down. Do you know somewhere that I can find more details about the technique eg how long for, how low KH etc etc. Heating my whole pond in winter would be v. expensive, so perhaps I'll just have to wait until summer. It's interesting that warmer water seems to ease the problem already, and cold water aggravate it, just in time for the annual show this year. Frustrating.
cheers, Richard
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