Please identify this urchin

[lorenz0]

I don't know if I'm a bad person or not, but I love laughing at your expense tony ha

not all the time but its entertaining

my rock urchin lives in the sump as well. Fat little bugger

[DACJ]

Hah, thanks for the input guys!

My tank had some caulerpa when it was initially setup, but I removed them all by hand long before this one was introduced into the tank, so I have no idea whether mine eats or not and I only see them at night...but I supposed all urchins are beneficial one way or another only got worried cuz it grew so much so fast.

I had to draw it out with measurement cuz I couldn't remove it from the tank =D and there was nothing to compare to anyway =P

[FishyFishy!]

Mine stripped a whole tonne of nice thick coraline off my established rocks.... so be weary!