New koi laying on the bottom

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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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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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