I'm too late to save your worm...but if anyone else manages to catch one of these alive I would gladly take it.

In my mind, you had something there that was a lot more interesting than snails.

I've reached the same conclusion about mantis shrimps. Hermit crabs and snails are pretty cheap and available! In my tank, they're food!

...just offering an alternative opinion. Everyone wants different things from their tank.

I had a zebra hermit that would kill a snail if it wanted a bigger shell. After a while he developed a passion for snail meat. He quickly went on a trip to the sump hotel.