@David Humphrey I asked Claude (I use Claude to search the Vermi-verse as my Research Dept. It can be very useful as I can't search as much as it can) and here's what my answer would be after I rephrased it's "stick up the butt" delivery style: Chow gone overnight? That's not a sick bin, that's a bin throwing a party and not inviting you. My money's on condensation. Bubble wrap is basically a greenhouse lid. The bin makes a little heat, the nights are getting cold, and the moisture rises, hits the underside of the wrap, and rains right back down on the surface. Congratulations, your worms have weather. It'd also explain why only 1 or 2 bins out of 16 do it. I'd bet those are the ones potentially sitting on a cold floor or against an outside wall. A couple other things can pile on too. As the bedding breaks down it lets go of the water it was holding, and it settles, so the same water ends up riding higher. And a crowd of busy worms leaves slime behind. Worm slime is shiny. It's like a snail's, only more motivated. The chow soaking up part of the shine overnight fits all of that. Dry chow is a sponge with a side job. Quick checks: - Flip the bubble wrap. Droplets on the underside = condensation, case closed. - Squeeze a handful from the top, then another from 2" down. If only the top is wet, it's surface stuff, not a soggy bin. - Sniff it. Earthy is fine. Sour means it's time to act. If it keeps happening, pull the bubble wrap for a day or two, swap in dry newsprint, and fluff in a handful of dry shredded cardboard. Keep feeding. Honestly though, a bin that eats that fast is doing something right. I'd worry more about the one that's glistening and NOT eating.