I have a couple of urchins in my nem tank and they do eat the coraline. I moved them into that tank because they are bulldozers in the DT. If all your corals and smaller rocks are held down tight, they wouldn't be a problem... but who does that?
__________________
The good thing about science is that it's true whether or not you believe in it. (Neil deGrasse Tyson)
Visit my build thread http://www.reefcentral.com/forums/showthread.php?t=2593017
|