Black Longspine Urchin

[beefchicken31]

Do they only eat coralline algae or will they have a balanced diet eating other types of algae plus seaweed?

 

[graveyardworm]

you should be able to find some answers here. http://reefkeeping.com/issues/2003-11/rs/index.php

 

[iamwhatiam52]

Mine eats EVERYTHING. Even damaged a coral once by scraping the surface off it.