It's PP time. Koi parasites and bacteria.

[@FARMOORKOI]

Good luck, it is always horrible when you have baterial issues, worse than parsites I beleive, but often starts with parasites, and then bacteria attacking open wounds or Koi with low immunity, anyway, good luck again, best wishes, Tony😀

[@marcusandcodiesKoi]

Thanks Tony. Fingers crossed 🤞