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So, here are the last news of my problem.
I treat the flukes with supaverm but the sickness continue to contaminate others koï. I phone to my Koi dealer and he said that he also had an oïdium problem, the best solution for him was to treat the pond with formalin and malachite (three treatment , one each two days) . Of course my filtre has to be re feed with bactogen , but all my koi are now in perfect conditions and the littles white ulcer desepear from all of them without lmeaving any injury.
I don't post any pict because I don't want to stress them more, but once again thank to all people who gaves me good advices
Marco
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