My pond is 1/2 acre. Never used SMB. A friend has approx 100 in a 2 acre pond. But rarely catch them after June. My LMB patroll the banks (even when I'm feeding) looking for small gills or anything edible. I've seen them chase frogs out of the water and FHM onto the bank.

But like I said... I put a lot of minnows in every year.