Too many BG in a pond will surely reduce the recruitment of LMB in a pond, but usually that is a good thing in a small pond. As for what size, I would say that LMB the same length as the BG should avoid getting nipped like crazy. I have caught 10" BG on 4" crankbaits shaped like a BG.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).