Pin Cushion Urchin poop or?

I was watching my new urchin last night and suddenly out the top came lots of little yellowish balls maybe 100 or so. Tiny things about a 1/16th inch. Do they poop like rabbits, or are they possibly eggs? If you think its eggs are they fertilized?
 
I have the same problem. What is the best "cleanup" crew member for this? I read somewhere the poop is mostly sand. Will it cause a rise in Nitrate???? Please advise. Thanks!
 
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