I believe the main diet of urchins is greens. If you have a good supply of algeas such as coraline, I think he'll be fine. I think you can also get urchins to eat some meaty foods aswell, but i'm not real sure about what kinds they'll eat.
I had a pencil urchin for a while, he would eat both the macro and micro algae in my tank. He would eat just about anything that I put in there, meaty foods and greens.
I finally gave him to my father in law for his tank, he needed an algae eater.
Ophiura,
Will the long spine black urchins bother mushrooms?
What size of tank do they need to be in?
Are they compatible with other urchins?
Thanks for taking the time to do a nice post regarding starfish. Maybe sometime you could do one regarding Urchins...... :joy:
Deb