Turbo Snail Re-produce?

[Sparty00]

I was looking at my tank this morning and noticed what appears to be a baby or really small turbo snail.

Is it possible for them to re-produce in a tank? I know I did not buy one this small and currently I have about 8 fairly large ones in the tank.

 

[Paintbug]

chances are they are collonista snails, which are often called mini turbos. heres some info on them about 3/4 down http://www.reefkeeping.com/issues/2004-05/rs/index.php

they stay small, no more than 1/4" in dia. are yours smaller than that?