small white shell sorta things on glass

[skooby]

I have noticed some small white things on my glass. They start in the center and go in a circle outward. There are quite a few and I don't know what the are.They look like a shell does.

 

[ocellaris_keeper]

skooby - look at what does ICK look like on my glass - I asked the exact same question two days ago.
these are tube worms - perfectly harmless and desired.

 

[25gator]

if they have tiny legs on a tiny body there copods i believe!

 

[fshhub]

<a href="http://www.reefs.org/hhfaq/pages/main_pages/faq_rock3.htm" target="_blank">look at this link</a>
and see if maybe it is foraminiferan, they are about 3/4 they way down the page, if it looks like them, they are definitely nothing ot worry about, but my guess is that they are definitely them or tube worms as mentioned
HTH