Oh...and if they are, then leave them alone. They are more than harmless, they are beneficial grazers.
Also look up "sundial snails" which are flat looking with a checkered kind of sundial appearance. They are a problem if you have zoanthids. They like to much on them. However, they don't show up much in tanks. Not as much as the collonista.
There's information on the collonista at our buddies pages on project DIBS, Project DIBS. OR.. hit the link on the left side of our pages, under "Site Partners"
Dave
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"Fins to the left...Fins to the Right, I'm going home to play with my reef tonight..."
If you're looking for me, and I'm MIA from the board, email me at JustDavidP (at) gmail (dot) com.
Experience in aquaria, 35 years. Experience in marine, 20+ years. Experience in Reef Keeping, 6 years. Always a newbie! | 
