[Enaykudisi]

Got any more details on how you're keeping them? How's the air flow in there? Is there a moisture gradient? Do they get anything other than wood and leaves to eat? medium size range is a bit of a head scratcher specific. I (personally) wouldn't worry too much about the worms. There's a whole lot of little bitty soil worms that swarm dead things and do a great job of getting in to enclosures on wood/leaves

 

[Enaykudisi]

If you prefer to hole tupperware its better to use a drill or a needle file. If you twist a phillips or a sharp tip of something to make holes alot of the raggedy plastic memories back, and much effort is wasted per the ventilation attempted to create.

Expired bugs, general decomposition and bacteria create gases wastes. In a small closed system of any colony kind, a domino effect of mortality can occur.

Not saying thats what has happened just mullin it over.

Or if you happen to have a soldering iron, those work really well for making holes in plastic
I'm also wondering if it's ventilation. I feel like Armadillidium sp. tend to be sensitive to low airflow. I don't even put lids on my Armadillidium anymore