For the last 3 months I have had about half a dozen crabs, couple blue legs, a couple scarlet, a few that look like blue legs but the red and blue bands are in the wrong spot, and 2 bigger green guys. They have all lived with 3 astrea and 3 very small nassarius snails. At Christmas time I went away for a week to come back and find all 3 astrea's upside down, one was still in the shell, but didn't make it. I figured the crabs might have had something to do with it , but thought that the snails just fell over, since the crabs haven't bothered them in the 2 months they have been together. The Nassarius are still doing fine. So on my way home from Christmas break I bought a turbo snail, and 3 more Nassarius, well it only took one night, as the next morning all 4 were on their backs. The turbo snail however was still in it's shell for a few more days but never moved. The day before yesterday I picked up 3 more Nassarius snails, which for 2 days they were doing great, well when I got home today they were all tipped over and 2 were out of there shells. And one of the smaller crabs was definelty picking at it 
.There are a ton of empty shells on the tank bottom now as there has always been, what has turned my crabs mad? Are the fake looking blue legs bad? Should I get them out of there?
.There are a ton of empty shells on the tank bottom now as there has always been, what has turned my crabs mad? Are the fake looking blue legs bad? Should I get them out of there?