If I am getting this right this would be the only thing bad about aeration. That it would stur up the copper that is on the bottom. But the benifits of aeration would out weigh the negitive of the copper sulfate. If I am right this would also stur up the copper and would kill the algae if you would still have an algae problem. Makes you want to really think before you do anything with a lake. You will fix one problem an start another. I have always told my fellow lake members you can nudge mother nature but you can't force her you will get another problem.