cwhitt said:Do you have earthworms (night crawlers) or wrigglers? From the photo, they rather look like earthworms to me. Earthworms like to burrow down, wrigglers like to stay up near the surface. I am no expert, but that could be your problems. Let's see what others have to say.
cwhitt said:Hmm, then I'm not sure what is going on. I wonder if the air is too cool for them? They do dig down when the air and top soil is getting too cool.