I was reading up on these guys today as I was updating their picture and info on my website. From what I read no one is 100% sure why or when they pulse. Sometimes they pulse, sometimes not. Sometimes just one head goes, sometimes the entire colony pulses together. It has been noticed that Xenia in lower flow pulse more than ones in higher flow (creating their own flow??)
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Gerald
Home:160Gal. Foxface, Yellow Tang, Blue Tang, Coral Beauty, Lawnmower Blenny, Starwberry Dottyback, Mandarin Goby, 2 Percula Clowns, Green Brittle Star, Brown Brittle Star, Chocolate Chip Star, Cleaner Shrimp
Store: 33Gal. Green Brittle Star, Chocolate Chip Star, Peppermint Shrimp
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