So when I was doing my water change, I had the tentacles of the bubble coral stick to my fingers. I didnt feel a thing. I had a few acltually cling to me, but I didnt feel a thing. I also had my hammer touch me with no ill effects.
BUT i did get hurt in my tank. While removing some macro algea from the tank I got hurted. I was reaching behind the rock formation to get the algea that was growning near the sand and as I was reaching down, I felt a sharp poke on the back of my hand. I quickly removed my hand and looked at it. It was painful, but not bleeding. I looked behind the rocks and sure enough, the urchin was there. It was just a gentle reminder to be sure where he is when I reach into a spot blindly.
BTW, my urchin has gotten huge and has taken a liking to the coraline in my tank. I have some growing on the tank walls and in the overflow tank so I know its a healthy enviroment for it. But It doesnt seem to be growing back on the rocks so well. At what point do I think of the urchin starving and need to remove it from the tank?