I've only been able to get approximately 60% of the RES of a certain batch feed trained, using a mixture of Optimal Starter #4 and Optimal BG JR feed. This is in a recirculating system. I agree, throwing a few BG in with them seems to help them figure out that the fish food IS food.

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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).