Have you considered just purchasing more snails?

that actually made me lol, not sure why, maybe I am a sadist!!?

I didn't buy the arrow crab to kill my snails, I thought that he would be a good addition and take care of the tank and get along with everyone else.

I really like arrow crabs, they are very interesting creatures. But I don't want to have to deal with snails dying every other few days and me having to spend 30 bucks a month on feeding the crab w/ snails. The weird part was that the snail didn't look chewed, or anything, it just had a ton of slime on it.

Hopefully I'll get something that works with the tank a bit better.