What is it?
 

I found this in my bottom tank today and I am not sure what it is.

It was in the sand bed with this side exposed, and it is perfectly flat on this side
http://members.shaw.ca/cyltic/temppic/shell_top.jpg

th other side is rough and a bit conical in a spirial as you see in the pic, this is the side that was down in the sand.
http://members.shaw.ca/cyltic/temppic/shell_bottom.jpg

what is it?

Steve

Its whats left after a snail dies and the meat has been eaten off. Well, that and a shell.

Yes true, when the snail withdraws into its shell for protection, that thing is like a hard door that closes and protects the soft snail. However, Mother Nature being a cruel bitch, has of course designed predators who can open that door. :( :(

ahh ok, i did lose a big astrea, it was huge so hopefully it was natural causes.

Steve