I have 3 in my little tank, and I had 2 in my 135. I love them. I spot mine alot easier in my small tank as there isn't that much rockwork but I did see it in the larger one also....but they are reef safe. In Missouri, the one I did have was pretty big and he seemed to love the rock that was in the front and center and he would get that defensive attack mode when I cleaned the glass. Never any of the ones I have owned to do do anything but pick stuff of rocks. So I am with the "Yea" crowd.