I ordered 200 of those snails you just got, and about 30 of them survived (sat in the mailbox for 3 days). I put in probably 10-15 I thought might make it.. but didn't and the hermits have since then taken over their shells! So now I have a buncha blue/zebra legged with black shells!
That is no good. 8O All of mine survived from what I can see they are still alive as well. However, I was able to greet the mailman at the door for mine. They are great though. They eat everything. My crabs are way too big for the shells on my Llanysus [sic?] snails. But they have cleaned every single one to a shiny white and green shell. I thought they were black too, that is apparently algae on them. 8O