Need ID ASAP!

Sagz70

Registered Reefer
Hey guys,

I was setting up rock into my fish tank and came across this little fellow. He must have been hiding in the rock and fell out as I was setting up my aqua scape. If you guys can ID it for me, that'd be awesome.

Also, is it harmful? I wanted to know before so I can let him go or have him stay in my tank.

Thanks!
 

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