Use a good floating food, smaller is better. As a general rule of thumb, I try to have the individual pellets as small or smaller than their eye. My LMB in the pond, even tho they are 4+ pounds will eat both Purina LMB pellets and AM 600.

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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).