I figured that it would be able to defend its self from the clowns if need be. My only concern is they are venomous, similar to bee stings, and I'm highly allergic to bees. It wouldn't stop me from getting one, just make me more careful.Good to hear!
Macros in the display can be a pain sometimes. Not sure if an urchin will eat it or not but if anything did I would say those would be the guys that would.
I think my macro algae took off because there was a long time between w/cs because I was gone.