Google Translate has improved a lot since its early days I see! Seems to have translated that in a pretty clear way, interesting.
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A few points.my priority right now are those "scratchings"
The advice you are being given in my opinion is correct. Your fish are ill and showing symptoms by scratching or flashing, fish become susceptable to diseases or ill when they are not kept correctly. You will not fully resolve your issues without addressing the root causes.