agreed with Lisak1, all the normal questionsMove them why?
Dropsy is a tough one to resolve in a fish. Once you see that level of bloating and pine coning it's probably too late. It can be the result of a number of things that are affecting the fish so unless you can figure that out, it's almost impossible. I'd separate it from the healthy fish for sure. I'd be concerned about water quality - do you do any regular water testing? How many fish do you have and how big is your pond?
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