What goes on top of worm bedding?
I have been vermicomposting a little while now and sometimes it seems to be working and other times it goes anaerobic. I know the worms and the decomposing materials need air, but a lot of what I see says to lay something flat on top of the bedding (like a few sheets of newspaper or some kind of mat). I have even seen a specialty mat that lays on top. Wouldn't that limit airflow to the bedding? Wouldn't that compress the bedding too?
I have a stackable bin system and the very top has a lid so light is not an issue. My question is should I have some type of flat mat on top of the bedding?