I would go with Melissa on this one. The first thing I noticed in your photo was the Asterina starfish. I know it attached after they were sick but in my experience, it seems they are hard to spot and can attach when the lights are out. I have had them wipe out lots of zoas before. If your parameters are all in check as far as Salinity, Calcium, Mag, and Alk, I would definitely get a harlequin to take care of the stars. After I got my harlequin who did an excellent job on the Asterinas, my zoas opened up great. I would also recommend taking some more pics even at night to see if there is anything else that might be munching...
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