sounds like a bristleworm, i have 2 of them crawling around my rock too. the vast majority are strictly detrivorous eating left over foods and such, i'm pretty sure one of the only ones that eat coral are the rare caribbean fireworm, so yes there good but don't touch them as they have a nasty sting i've heard, alot of people consider them as part of there clean of crew, but mine are only 1/2'' each so i can't imagine them being of any noticeable help...yet...
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