I'd not waste my time trying soy, it by itself won't do anything, it has to be mixed with a lot of other things to make it digestible to the fish.

I would buy a years supply of food when it becomes available if you are having that much of a problem sourcing it during the year.

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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).