Soo... two years later and I have NOT treated the CLPW at all, and it is not a problem whatsoever any more. Sure it is here and there, but for the most part it is tame in my nutrient poor pond.
Far less coverage than I expected, way better than I dare hoped! If it were going to go nuts, it would have been this cool summer. The Koi may be denting it also.
Sometimes it is best just to relax and not rush into fixing a "problem" when it really isn't one. Turns out the stuff makes excellent cover for fish fry, clarifies the water well for swimming, and is somewhat aesthetically pleasing. Better than nothing but chara and FA. The ducks keep devouring my eel grass, so no hope there.
