Last friday I added 15 hermit crabs and 15 snails to my fairly new 29g biocube. In the last few days, I've noticed 2 hermit crabs out of thier shell and what looks like dead. There is no actual body attached just the legs and head but no soft body. The really weird thing is, I can't find the empty shells!! Could they have molted then just got back in their shells and went on about thier way? Could I just be seeing the old exoskeletons? Its wierd and kind of disturbing to see little hermit crab skeletons floating around in the current!! One more thing, since the tank is fairly new should I be feeding them or is there enough "stuff" in the tank for them to feed on?

Thanks,
Deanna