I think that the natural behaviour is to open/feed at night. Yes, you do have to feed each polyp.
They will open in response to food. Feed the fish, then return 1/2 hour later and the polyps should be open. Then you can target feed the coral using a turkey baster or something like that.
If you do that at a consistent time every day, you'll find that they start to anticipate and open early.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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