quick question for you

[niloc16]

i was looking for your input into your experience with urchins. i'm looking for a good reef safe urchin to help with a little hair algae. none of my tangs touch it and it is only in small certain areas of the tank and it annoys the living hell out of me so i was thinking of trying an urchin. i really dont want to go the sea hare route and have him die off when these little patches are gone. any advice would be cool, thanks