Either size is the same recipe, the 500 is smaller. If the fish are used to eating smaller food, or haven't been on food before I would use the 500. If they were eating the generic farm store fish food, then 600 will work.

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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).