One of the issues with medication like copper is for some fish a certain dose might be tolerated while to another it's a death wish. Copper is poisonous of course and does not discriminate. I am no expert on fish disease and my last experience of dealing with such go back over 30 years. The same old diseases are still there and the medications etc don't seem to have changed so much, copper in whatever form still being the method of choice. My self and that of others believe we found a better way to combat disease and parasites which have worked for us for many years.
I liken it to Luke Skywalker when he is in his X-wing fighter trying to destroy the dark star was it. Anyway Obi One Conobi guy tells him to turn off the technology and targeting system and use his own ability or whatever it was and he destroys the itch I mean the dark star. Might not be such a good analogy but I liken it to going against convention to achieve a the result.
I liken it to Luke Skywalker when he is in his X-wing fighter trying to destroy the dark star was it. Anyway Obi One Conobi guy tells him to turn off the technology and targeting system and use his own ability or whatever it was and he destroys the itch I mean the dark star. Might not be such a good analogy but I liken it to going against convention to achieve a the result.