Looking at your tank at night with a flashlight, you’ll see a whole different world. Some corals retract, some expand, some only feed at night, microfauna you don’t see during the day come out, sometimes you’ll see stuff spawning, sometimes you’ll look on a night when something has released larvae or eggs have hatched and the water’s full of swimming little whatevers only to never be seen again. I will often sit in front of my tank at night for an hour just watching, its often just as interesting if not more so than when the lights are on.
