Identification Please

Okay its a white discish thing about 2 mm in diameter with 7-9 .5mm *spines* coming out of it at odd angles, there are more than one of them in my tank, they tend to stick to the glass or a rock for 2-3 days then disapear, they apear to like light, they attach with the "spines" which leads me to the conclusion that maybe they are a very small echinoderm larve. I never see them move however, I've seen them in three places, on a rock in the from, down in the shade below my intake, and in roughly the midde of the pain on the left of my nanocube (all three locations are on the left of the nanocube btw) and I've seen more than one at a time, as many as three.

I'm attaching the best picture I have, although there is one right on the glass thats pretty good for a pic and a little bit bigger it would be a pain to focus on.

I've got 'em too. They're filter feeders and are a good sign that your tank is coming along and maturing nicely.

Here's the info from wetwebmedia.com:

Spiral "thingies"
While cleaning my marine tank yesterday, I noticed a bunch (25-30) of small (about the size of a pencil or pen head), white, spiral thingies (for lack of a better word) on the glass. I was able to scrape them off using only my
fingernail, I was just wondering if you guys had any idea what they are. They felt almost like a rock, but not as hard. Thanks for your time.
<Very likely some small species of tube-dwelling "bristleworm" (sedentariate polychaete annelid). No problem. Please see here:
http/www.wetwebmedia.com/polychaetes.htm
at the bottom, family Serpulidae.
Bob Fenner>

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