Sillybird--wow! Gorgeously organized and clean and everything mine isn't...LOL...
Now that it's warming up (I'm up in the Oro-Chico area of CA), the mealies are getting the boot from the house to out in the barn on top of the rabbit cages, since that stays anywhere from 80-92 F or so in daytime.
Sooo...sounds like the dollar store is going to make a bit of $$ from me here; go get about a dozen more of the big flat 'keeper' boxes and melt a buncha holes in the tops, then start splitting...I'm thinking that, since most of what they currently are in is frass, I'll do half fresh bran and half 'stock' with all the babies and see how it goes....? What density were/are you raising them at for best growout?
What have you found to be the best way to hydrate the teenies? I tried carrots and while they adore them, the darn things keep molding up on me even in an open box! Now doing a 'wet bedding' arrangement where I pour a small amount of weak tea down the middle of the box and they seem to migrate to that and be fairly happy...?
I plan to keep two bins of about 3,000 beetles going, swapping bedding about once a month for growout. So I'm figuring the first 6,000 worms big enough to pick out are set-asides for breeders and the rest get to grow out and be either fed or frozen for winter feeding. It's not like the chickens think that there is ever enough of them, after all...!

Monsters! Of course, being just down the road from the lake, I figure on a few bait sales to help pay for the bran and time.....
But I must admit, there is NOTHING like mealworms to get your chickens up in your face waiting for the next one!
