I'm not 100% certain but I do think that when it's pulled in really tight over the skeleton that it is a response to something it doesn't like. Espescially if you're not noticing the feeder tentacles ever come out.
Things to watch out for: It could be too much current, too much light (if it was moved recently), or a parameter that is changing too quickly, or a parameter that is outside of optimal range (e.g., high nitrates). Or it could be that someone is picking on it.
I see you've listed your lighting @ 192W of PC so I'm somewhat doubtful that it's the lighting in this case. So the next things to check would be the nitrates, maybe even phosphate levels, water currents, anything touching it (neighbouring corals ... fish... shrimp .. anemones... etc.)
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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