ok, this guy is a money cowry. I had 2 (as shown in 1 pic) but the smaller one died. the pic will go as follows:
1. shot of it without the black stuff
2. shot of it with the black stuff covering alot of it
3. shot of it with black stuff covering all of it
4. close up I liked.
as you'll notice from the pics it lacks the long mucus liek thing trailing it, its not one of those things that is has all the times, only when its moving. Mine is quite stationary at the time of the pics.