Garry said copper sulphide you can get it at the feed store. toss a handful into the weeds. I don't care what they said. Garry and I had large mouth bass in his pond the size of your leg and it never hurt anything. His pond is full of sunfish and bass and one hell of a lot of painted turtles ... so it didn't hurt anything .. give it a try bobster and put a couple of bass in that pond.

His pond had nothing but small sunfish, he and I tossed 4 largemouth bass in it ... in less than 3 years it was filled with huge sunfish and monster bass. They ate all the small fries and allowed everything to grow ... monster bass fishing and throw back in is a heck of a lot of fun