Well for a pond, you can go for it, I just dont really see it doing any good though, like I said you need quite high levels of copper. Perhaps the copper will help the fish with gout or something ...
__________________ The bitterness of poor quality lasts long after the sweet price is forgotten
Well, if one of the causes of gout is sugar and alcohol consumption, then cut the dosing of sugar and vodka- that should clear up any gout in your fish.