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They may be just adjusting to your tank. I really don't think that the bristle worm is causing them not to open.
how long have you had the zoas? What kind of flow do they have? Did you get them through the mail, from a store, or from another reefer? how long were they in the packaging for. I got some that were shipped overnight, but were out in the 20 degree weather for half an hour. The temp in the bag was about 62 degrees when I opened them. It took them almost 3 weeks to totally open up, and now they're fine. So, I really wouldn't worry about it too much yet probably.
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