Copper features in a pond

[Stonehenge]

As I understand it, copper is bad for fish. I have a guy who just bought a bunch of cute, heavily oxidized copper "things" (small statuary, sheets formed to look like mountains, lily pads, etc).

Is there a way to mitigate the effects of the copper on the water to allow fish to enjoy a pond with these in it? Any kind of weekly water treatments or special filters?

[Lanelle]

Could you possibly lacquer the copper to seal it? I would use a clear sealant. This would have to be repeated occasionally but might be the most direct method of controlling the copper.