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Thank you to everybody for the goos advices you gave me.
My water analysis seems normal.
I took my microscope home this afternoon to search some flukes like Mike was sujesting and I found them...
Maybe they are not the main responsable of my problem, but anyway I will treat the pond with Supaverm.
I will heat my pond with a higher temperature and put my flotting cover away and wait a few days to see how everything is going on. If the problem doesn't take a good evolution, I will make an antibiotic injection (Nuflor) to the two hill kois and salt the pond.
Anyway I will let you know in a few weeks the result of the treatment and send some picture again, and once again thank you.
Marco
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