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Hi Dags,
Here where I live in South Africa my main pond seldom goes below 10c and usually stays between 10 and 11c. I never in 6 years had any problems with my koi during winter at these temps and I think personally keeping koi above 10c during winter is a waste of good money.At 10c my koi stay eager to feed and get fed three to four times a week very small amounts.
Jaco.
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