seffieuk
I used to be indecisive but now I'm not so sure!
This is the only urchin I kept out of 3..be wary in smaller tanks though..actually eat into rock as well as coralline to get microbes to digest. Yes they are poisonous and will cause swelling and stinging if tagged, followed by stiffness. Caught by mine a couple of months back on the knuckle and it took over 6 weeks to finally heal over with pieces of spine emerging for almost 4 weeks from the point of entry.
Mine has developed a taste for star polyps and stripped a mat of them overnight !!!
Ow, nasty
Seffie x