They sometimes close up and it doesn't look so good at first. But if they're opening again then I wouldn't sweat it, it's probably normal.
12 hours should be fine, that's what they (the corals) get in nature in the tropics. Longer than that just means the nighttime is shorter, and actually some things need a full night's rest. So I'd switch to just 12 hours if you haven't already.
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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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