Moon light???

[tlhood]

I usually have mine on for a bit after lights out, and a bit before lights on. Then at night it's usually dark.

Sometimes my YWG gets antsy and turning on the moonlights keeps him from messing around my powerheads and bothering my clowns, so I will keep them on once in a while, but since the tank is in my room I usually have them off for most of the night.