Having an issue removing urchin?

[nightOwl]

I have a bit of a problem. I had some live rock for over 10 months and there was a little black dot on it when I first saw it. The little black dot grew and I finally moved him to my refugium. He disappeared for about a month or two and I started noticing the glass and rocks were being cleaned of corraline algea. I found that my little black dot has now grown to a bit smaller than a ping pong and is starting to knock rock over. So he has to go but he has long spines (1") and they are sharp. He keeps wedging himself in the rockwork and now only comes out when the lights go out. I guess he has learned that being poked and proded is not fun. How do i remove him without hurting myself? I am tempted to kill it but that's mean and I dont want it to release any toxins in my water. I read that getting poked by one of the spines hurts like heck and I dont want to experience that either.

Thanks,

Henry