WTF!!!! OMG is this a reef spider?????!!!!!!!!!

[fishoholic]

I found this in my sump sitting on top of my cheato last night and OMG it looks like a spider!!!!! BTW did I mention I HATE spiders!!!!!!! I've never seen anything like it before ever! I'm guessing it came in on the new rock Doug just got for me. Any ideas as to what exactly this is? Good/bad??? Although I guess it doesn't really matter since it's in the sump now. I should add that it's fairly small about half an inch (roughly the size of my pinky finger nail) in size.