Bristleworm?

[murkbird]

I am new to salt water marine fish tank and just starting out. I have put live rock into the tank and introduced a scarlet cleaner shrimp who seems very happy after just over a week. I just noticed a caterpillar spikey thing about an inch and a half long. not sure if this is a bristleworm and will be a threat to my rock, coral and Shrimpy (very original name ha). Any advice very welcome. See attached pic.
Not added any fish yet as want conditions perfect before I do.
Thanks.

 

[bribo12]

Harmless bristle worm


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[mr_X]

Harmless unless you touch it, but yes, I'd leave it in the tank.