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It's been my experience that the large german scales on doitsu do not grow back at least the ones along the lateral line. Not sure along the dorsal.
Leo, It looks like you have a problem for sure. Can you tell us more about the pond itself? Type/size of filtration? Total gallons of water in pond? The amount of fish? Clear water is not an indication that the water is good so can you give the ph, kh, gh, nitrate, nitrite and ammonia levels? Do you have a microscope? Roughly where do you live as there may be a KHA that lives nearby that can help you out in person. And finally the water temperature.
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