Setter- how old are your SMB and what size now? I would think SMB could reach 3-4 lbs , especially if pellet feed and/or adequate forage base...would just take more time than LMB.
I am planning on doing a SMB, YP, HSB, HBG pond (currently being built as I type)


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3/4 Acre Pond: HSB,SMB,YP,HBG,RES