Mine hang out together like that on occasion, too, showing no signs of life at all. Then, all of a sudden, they're off and running (around 5pm each day). The other day, two of them were wrestling for a few minutes.
I ordered some new shells, as I'm not sure how often/when they need to move into larger digs, or what the behavior is that leads up to the move.
Right now, I only see one. The others are hidden in holes in the rocks, I guess. We'll see later when the lights come on.
Strange occurance, though. There are remnants of what appears to be a dead crab, but since all of my hermits are accounted for, and there are no stray shells, I have
NO IDEA where it came from. I have to think it was in the
LR when I got it from the
LFS. I can't tell for sure if it was a hermit, but the legs have the same red color, and it appears to be a crab. I can't explain this any more than I can explain a 7-armed micro star that appears on the back glass every few days. (Looks kind of like one of those wagon-wheel pastas).