Hi, i have a 8 gallon biocube with settings for day, sunset & night. There is no off button to turn the lights off at night so, do i leave the darkest blue light on all night? or do i unplug it at night?
Are you referring the LED moonlights? If so, you can leave them on all night or turn them off a few hours after the lights go off... it's up to you. Maybe set them up with a timer. I have mine come on a few hours before the main light and turn off a few hours after the main light.
I have my LED moon lights on all night after the main lights go off. But that is just me. If on the other hand you are talking about the actinic lighting (normal light bulb sized) that is something a bit different and those shouldn't be on all night.