Corals will be fine, IME it's fish you need to worry about, if they don't go to sleep with the lights on (some don't care, but some might) they can get a little woozy. If you notice anything just give them a lights-off period for a bit. At least that's what I'd do.
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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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