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I think urchins may take care of it, but would wreak havoc on any coral and coralline algae you may have in there. Could you post pics, I'm curious what it looks like.
This is not my tank, but because i don't have that good of a camera i thought i'd post a pic i pulled off the web. So far i've heard naso tangs, sally lightfoot crabs, and urchins may take care of it.