I have several snails in my tank, most seem to be OK but occasionally I'll find an empty snail shell. The snails dying seem to be the smaller ones. I had two nassarius snails die about two weeks ago (one might have died when originally acclimated, or wasn't even alive after receipt of shipment), and one cerith snail recently.
I have two blue leg hermit crabs, and two hitchhiker crabs (one IDs as a porcelain, the other is very small with tiny pinchers), plus an emerald crab that I added per advice of lfs
. I may have more crabs that I don' know of...I have already removed 4 with a simple trap that I setup over the past three weeks. ..but even since then we had a snail fatality.
I'm thinking the snails are becoming dinner for one of these crabs that I know about, but was wondering what else might cause this. I did a quick search and read somewhere about voltage in the water... someone said if the snails gather at the top of the aquarium you might have this problem. Some of my snails definitely do that, but not all. Seems like the astreas do that more than the others.
Is there a "top ten" list of reasons snails die, in order of likelihood? Would you think the crabs are the culprit, or should I check for other things? I also don't have any fish yet, and actually the snails have done a great job of controlling algae that was growing everywhere that is now pretty much gone...could the snails be dying?