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I use moon lights controlled by a controller. They are 5mm LED's that emit a lot less light than the main lights. I have a mix of blue and white. The intinsity can be controlled for each color seperately. There is not enough light at max full moon to see any better than you can outside under a full moon. The color is about the same as moonlight. I am not sure why this would be an issue since this happens in the wild. Also I am not sure that it is any better than no lights other than to me it seems more natural. So I guess it is more of a personal preference. I would not keep the daylight blues on as those would be way too bright.Not exactly sure how blue lights effect our tanks when our critters are trying to sleep, but studies show that at sleep time, blue lights NEGATIVELY effect humans and other primates.
I'm sure that no harm is being done. Take a look however at dragon99 's link above. The actual spectrum of moonlight is mostly RED with very little blue. Many of us are carefully mimicking the phases of the moon without considering the spectrum being delivered. This is probably because to the human eye blue makes our corals appear florescent, while red light would make them look dull.I use moon lights controlled by a controller. They are 5mm LED's that emit a lot less light than the main lights. I have a mix of blue and white. The intinsity can be controlled for each color seperately. There is not enough light at max full moon to see any better than you can outside under a full moon. The color is about the same as moonlight. I am not sure why this would be an issue since this happens in the wild. Also I am not sure that it is any better than no lights other than to me it seems more natural. So I guess it is more of a personal preference. I would not keep the daylight blues on as those would be way too bright.
Almost all of the reef fish that we keep actually DO stay in one place most of the night. In fact, once our fish have selected a safe hiding / sleeping place, they will typically return to it every evening at dusk.if it's complete darkness then it's not good for your fish. They will jump more often therefore they could injure them self or worse jump out of the tank. Out in the ocean the moon do give a little light for them to navigate at night, most fish don't stay in one place and sleep.
Did we change hobbies all of a sudden? I didn't think anything could be cheap with reefing!This will probably sound crazy, but I have blue LED Christmas lights dangling from the ceiling above my tank and I never turn them off. It gives a very nice warm glow when it's dark out. Not overly harsh or too bright and they're cheap as can be.