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Brutuscz: I think you need to get an experienced Koi Health Advisor to pay a visit. The fact that you sterilized your system, quarantined the fish, etc tells me that something is happening that needs hands-on, eyes-on investigation. Dropsy-type symptoms usually mean internal organ problems, which could be related to bacterial infections but could be other causes. If the fish were doing fine in q-tank and ulcers start upon going into the pond, it would seem something is in the pond causing it, but it could be something "in the fish" which starts to show only after a longer period than you gave them in the q-tank. Maybe it is so simple as re-experiencing new pond syndrome, but you have exhibited enough knowledge that I'd think you'd be on to that through water tests. ...BTW, since you treated with F/MG before using the scope, it is kind of difficult to know what was there before. You may have gotten rid of parasites at the root of the problem and now need to treat for the secondary problems.
Good luck.
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