ID please

[ugluk]

My tank has been running for 2 1/2 years and havent added anything new to it in a while yet I'm starting to see new creatures. One I was able to identify as astrea stars (used to see the baby bristle stars but not any more) but I am unable to identify this snail. Could anyone tell me what it is and if it is harmful to my tank. Sorry I couldnt take a good picture:

http://i255.photobucket.com/albums/hh126/alaw154/Picture193-1.jpg

http://i255.photobucket.com/albums/hh126/alaw154/Picture192-1.jpg

[CharlesVI]

They look like they could possibly be limpets, but that is just a guess.

[Salamander]

Either your pods have learned to construct pyramids to worship their gods...or they're limpets.

[Goby-Wan Kenobi]

Either your pods have learned to construct pyramids to worship their gods...or they're limpets.

Now that is funny. Yes, they look like limpets.

[Salamander]

They seem to be arranged in some celestial alignment.

[Chiefsurfer]

they sure do look like limpets. I have heard some are bad, but at least the ones I have are all good. The way to tell(and it's very easy when they are on the glass like that) is to look at their mouthes. If their mouths look like a tubular mouth, that someone gave a fat lip(swolen) then it is an algae eater.

Very cool things, even though they move REALLY REALLLLLLLLY slow. Thing of notice, they poop through the top of their shell. I kinda got startled one day when I saw projectile from their "keyhole" then i found out it pooped.

[T Man]

I've heard limpets can scratch acrylic, but glass is okay. Other than that, SCORE! Tinman

[MOB1224]

I heard that the ones that have a hose like thing sticking out are bad for reef tanks but the others are ok