Like I said for me I leave them on. I happen to like the effect and there very very dim. I like the shimmer effect when it hits the rocks. The tank it catty cornered in my bedroom. But again I don't have the option of turning them off unless I unplug it. The white and blues have seperate switches which is nice.
I guess it's preference. I mean there's moonlight in the wild right?
My 75 gallon african Cichlid tank is one all night. Just to add....
"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