I added LMB a year and a half ago to my pond that was overpopulated with GSF, i mean loaded with them. Now, all but the very largest GSF are gone and i assume those will be wiped out by the end of the year. Now im scrambling to replace forage.
Point is no matter how much forage you think you have LMB will wipe them out. Assuming you have a pond and not a lake?
I addeed 1-2" LMB and they thrived!