dbhelm, I've just never heard that nor have seen the documentation. However, I'm not an applicator and there are a lot of things that I can always learn more about.
It seems to me that, even in low amounts, it would affect yoy fish of other species. But, again, I'm not a trained applicator.
It would certainly have to be done carefully. Since I take a shotgun approach to just about everything, I wouldn't be the one to do it.
