Salut!
It's an interesting topic...
Any fish in your tank? I read somewhere...fish sleep and need some darkness....but also some light (like the moonlight) for orientation and for any "attack" detection...
What i do, I leave the curtain slighthy open (never close)...or a small 4 watts light in the electric outlet...close to the aquarium...
I believe, the coral photosynthesis require some rest....like in nature!
Pierre
from Montreal
(Sorry of any english mispelling)
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