Help-What is This?

[Chefyug]

I have a Reef tank running about 15 months. I found this on the underside of my filtration pad. It must have come up from the live rock. There were also about twenty copepods in there as well. I removed the big ones and placed them back into the tank. Is this safe to put back into the tank as well or should I leave this in with the live rock? Thanks,
Guy
Sorry, I could not figure out how to upload the picture!

https://docs.google.com/document/d/1aiSKJFjyOvY8ENYavFsHV2LgOgmpZZrTIA0VPE86AWs/edit

 

[helen ann]

brittle star

good guy

 

[Chefyug]

brittle star

Can I put this in the reef tank?

 

[helen ann]

Can I put this in the reef tank?

Its a good guy

http://www.lionfishlair.com/hitchhikers-guide/

 

[Chefyug]

Its a good guy

http://www.lionfishlair.com/hitchhikers-guide/

Thank you! This is the third one I have found, but the others were so intertwined in the filter pad I broke them trying to get them off it!