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IMHO you are keeping way to many koi in those 560g.
Please keep feeding very little and few, do a continual water change, and I also would add more air to the tank, two air stones sounds very little.
As said by others, please (get someone to) determine what is the cause of the problems and use the proper medication. And never use a broad spectrum anti biotic to battle something when you do not know exactly what is causing the problem.
Succes and keep us up to date.
Regenmeneer
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