Pencil sea urchin

[shannon32]

i have had one for about 8 months now and it hasnot touched anything yet should i mabe get it out before problems start?

[whatcaneyedo]

Another one to avoid is the rock boring urchin. Mine loves to chow on the silicone seams of my aquarium. I've watched other for sale at the LFS doing the same... fortunately I was able to put mine in my frag trough which doesn't have any silicone.

[Douglas]

I've had one in my Tank for a couple of years now, rarely see him, and he's a bulldozer, pushing everything out of it's way. Never had a problem.