CZ, a 12-14 inch bass can eat any crayfish you are likely to grow. I wouldn't worry about that.
If you want to maximize LMB benefit from forage pond, you might consider adding BG. True, they'll eat the FHM, but LMB gain far more from eating BG than FHM anyway. And I don't believe too many crayfish would be eaten by the BG.
But it ultimately depends on your priorities & goals. Boiled crawfish sounds mighty good to this Louisiana boy!
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