I like to give both my freshwater and saltwater tanks a total darkness time. I look at like this. I wouldn't want light 25/7 and it does get dark in the wild. Yeah dim moonlights are nice but at 2-3am to 7am I better be sleeping so... Night time for everyone it is lol.
I believe the moonlights are for your viewing pleasure.
I actually use to have moonlights on my 75g African tank and it seemed to have changed there temperament so I switched back to total darkness at 10pm. You still have room lights or lights from the TV until everyone finally goes to bed.
Long post I know but you the point.
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley