Not sure but my guess is that you have some Nassarius Snails. My last tank had many and I could only see their "nose" during feeding or at night. If it is these, they are great cleanup crews for your sand.
"These tiny (1") snails are incredible detrivores. They will typically bury themselves in your sand bed with just the proboscis ("nose") sticking out of the sand bed."
__________________
Dave.
|