Ok David let have some fun!!
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Here's an interesting document I found that shows that in coral bleaching Zooxanthellae are released. It also states that bleached coral might not be dead
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Yea but the percentage of recovery from bleaching is very low. The expulsion of zoox is an internal function of the coral to try to survive. It releases a heat stress enzyme that causes the zoox to bail. This happens in temps close to 30 C, technically the coral is still alive but having dumped the source for 98% of its food its on the way out. Now corals can retrieve zoox, but 99% of the time they cant do it fast enough not to starve.
Lighting didn't really pertain to the experiment you listed it was more of a inject warm water until the coral bailed it polyps.
Mike
