If you have live rock then your going to have some worms. Bristle worms shouldnt pose anykind of threat to zoas. I have all kinds of worms in my reef. Bristle worms can pose a threat to sps, but I've never had a problem. What are your perameters? How often are you feeding? More than likely its a water quality issue. Do you have a skimmer? How many watts of light? All of my zoas open under halides.
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