If you're referring to the opening being at least 3x the pellet size as the problem, then no, that isn't the problem because the AM 600 pellets are roughly 1/4" diameter.

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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).