An urchin may or may not work. I had an algae called dictyota, that was close to getting out of hand, the faster I cleaned off my rock the faster it would grow. Water changes made no difference, my yellow tang , several varieties of crabs and snails, or my tuxedo urchin wouldn't touch the stuff. Finally I found out that the only thing that would eat it was, either a Naso tang or a Foxface, both of which grow too large for my current tank, but since I was in the process of up- grading, I went with a baby naso. It took care of my problem in about 2-3 months. Long story short, try to find out what type of algae problem you have, then look for the remedy. Good luck.
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