I have GSH, FHM, YP and WE in my 3 year old pond. The GSH were given a year head start on the rest and now I cannot throw a #8 or #10 hook in the water without it immediately being grabbed by one. Because of this, I have no idea if any of the 1000 6-8" YP that I put in last year are still alive, I have never been able to keep a baited hook in long enough.
I know I have a very healthy supply of GSH, however they were not able to control an FA bloom I had early this summer. I had to resort to a chemical control.