ROFL!! I was just thinking that a few hours ago while I sifted/sorted worms and beat off the three young large breed pullets! Such piggies they are!!! Very sociable, though.
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When I set up my mealies originally, I had one box that was 'all in one'. I dismantled it this summer due to the excessive loss and lesser production compared to the separated system (beetles get put in boxes, when the first substrate starts moving, the beetles move to new housing and begin again in fresh bran; I sort out the big fat ready-to-pupate worms and pluck pupae to a separate box for hatching, and it all begins again).
At one point, I scooped and counted--about a thousand worms per two-cup scoop of bran and hatchlings big enough to handle with my fingers (not very big, call 'em small mediums). But in the all-in-one, there was much more fine frass and far fewer visible worms despite starting with the same number of larvae. *shrug* Do what works for you--everyone's situations are different and that's going to result in a lot of variation.
I CANNOT RECOMMEND TOO STRONGLY THAT A MASK SHOULD BE WORN WHILE WORKING WITH MEALWORMS!!!
Because of my sensitivity to both elevator dust (grain dust, all kinds) and the mealworms' fine frass, I'm now on an inhaler, something I hate, but now I'm stuck with it. Better to wear a mask than even start the cycle, folks.
Amy--Yep, the spiders just loooove the babies. I recommend a fine muslin type fabric that has a relatively low thread count, so it is allowing air and yet is still smaller holed than most screen. Up here in the Sacto valley, I run mine with lids on and have no problems as long as the lids are just laid on, not tightly latched. The only time I *do* have trouble is if I put in too large a carrot or too many bits of moist material. Then I leave the lid off and lay an empty feedsack across the top so chickens (hopefully!) stay out but moisture takes a hike.
Good luck everybody!