Urchin Unglued Coral?

[TeeSquared1214]

So I’ve had a candy corn chalice that has been glued to this rock for months, not even slight movements or bumps with tweezers would wiggle it. Yet, I come home to find this guy wearing it like a freaking trophy?!! Dude is an absolute unit. How do I stop him? It was super glued to the rock what I considered to be pretty secure, but obviously not. Sorry for poor quality pictures, still learning the photography aspect.

 

[DD Corals]

I have the same problem. My urchin occasionally takes stuff off the rocks but mainly my mushrooms. He has taken zoas off the rock. I love my urchin but he makes a mess out of my tank occasionally. I find if he is holding something he tends to hold onto it for a long time and doesn’t grab other things as much. Most of the time he doesn’t grab stuff that’s glued to the rocks but he occasionally does.