I still don't really buy into the moonlight and coral spawning thing for a few reasons.
Unless you stay up all night, everynight with a flashlight, you won't know when the spawn takes place! The spawns don't amount to anything, no new corals grow from them (not in our home aquariums). It's been tried, and even the experts can't get the spawns to "filter out".
Coral spawning in our home aquarium can be dangerous...depletes O2
Aren't stony corals the only ones to spawn? And if so, they would need to be years old in order to spawn, and very large.
It's true, I think that research has been done that proves that corals that are old enough/big enough to spawn do it in certain intervals after moon phases.
So, I believe that in our home aquariums, there is no benefit to having lunar lights.
Here is a cool Q&A with Charles Delbeek.
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