That is not worm, but a mollusk of the Order Nudibranch, family Tritonid and more than
likely it is the species Tritoniopsis elegans, common name Elegant Nudibranch. It is one
of the nukes that you don't want in your tank for sure, as they feed off of corals and
this one is nasty

http://www.seaslugforum.net/triteleg.htm
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If You See Me Running You Better Catch-Up
"Chris" wrote in message
.. .
: http://chrispol.ath.cx:8080/img1.jpg
:
: well saw what seemed to be a new cluster of polyps this morning, but
: this evening it was on the other side of the tank, anyone have any idea
: what this is??
:
: Thanks