Have you heard of the method of hanging a lantern above a shallow kids pond at night? It supposedly attracts the bugs, the bugs thump into the glass, fall into the pond. If it is shallow enough, with something for the chickens to walk in and out on, that could help supplement the diet as well.
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I would be interested in seeing some more pictures of your bin!
My worm bin every year gets full of BSF. Maybe I should put a ramp in...