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The red on the Doitsu Koi is an infection under the large scale. It is best to clean it out and disinfect it. I use a cuetip and mercurachrome. Once you have done that I would use another cuetip and swap some Lamisil under the scale to try to keep out the infection. Keep an eye on it to see if it worsens.
Both the problems with you Koi are a sign of water quality problems.
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