Rock Urchin & Anemone compatibility?

[djordje]

I recently added a beautiful rose bubble-tip anemone to my 125 reef setup and have a question regarding one of it's inhabitants. I have a rock urchin which crawls around the glass and rocks and does not seem to harm anything at all. In fact, I admire it's simplicity. Last night, the urchin was trying to get to algae that was underneath the foot of my urchin and they were in very close proximity to one another. The urchin then left after the anemone stood secure. Does the anemone have enough sting to back off an urchin, or am I just worrying where I should not. Possibly the urchin was doing it's normal grazing and realized a threat? Open diameter of the anemone is about 7". I want to make very sure that this anemone is not in any danger, before something happens.

Thank you.

[Geoff]

urchins are just moving rocks. when they can not go any further they turn around. i do not think the anemone will hurt the urchin. not sure if the tentacles would reach to the body of the urchin.

G~