Identification help needed!

[Guys! I just saw this pink catepillar looking thing crawling out of a hole in my live rock! It has white spines in a double row on it's back. I can't see the whole thing because it keeps getting scared back into the hole in the rock...so far I think it's about 1 to 1 1/2 inches long. It's only about 1/4 inches wide. I don't have a camera that can take a good enough picture to show anyone. Could this be a sea slug or ??

Thanks!]
 
[Steve it's a bristleworm...they won't cause any harm. Just don't toch it. I hear there bite can be nasty...

p.s. How is the 12g doing?...]
 
[Guys,

Yes, it's a bristleworm...I verified it on the id page of Marc's website. The 12g is going great...I have added a few things to it.]
 
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