i would do a water change. i never keep urchins so i am not sure if that is normal or not, but better safe then sorry. water change and isolate him just to be safe till you get some more feedback.
http://slojmnsreef.homestead.com/homepage.html Take a look at the picture of a blue tuxedo urchin spawning - is that what's happening to your urchin? If so it's nothing to worry about and will occur periodically. Think of it as supplemental food for your filter feeders.
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