Large polychaete- keep or remove?

[Anomal0caris]

Found this bugger after moving the rock work around. Are large polychaetes reef safe? It is about 7-8"and olive green to black. Keep him or feed him to the mantis shrimp? Pic will be uploaded later...

 

[Anomal0caris]

 

[Recty]

I dont think you can share from Facebook like you were trying, instead upload your photo to Photobucket and you can link to it from there easily.