New koi laying on the bottom


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Water Valley, Alberta
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For a healthy fish, the maximum rapid temperature change given similar water quality parameters (KH,PH,NO3) is 5 Fahrenheit/2 Celsius difference.
Any more than that difference and the reaction will be negative - possibly fatal.
 
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Mid wales, uk
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Down to minus 5 deg celsius on rate occasions
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United Kingdom
The fish did not survive, one big lesson learnt here. Don't put koi in your garden pond from warm water during winter
 
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I'm sorry to hear that - I think it's a shame that whoever sold you this fish wasn't more clear on how to handle introducing it into your pond in the colder weather.
 

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