Here is a good lighting system and you have the choice of either new or refurbished. You can save a lot of money with refurbished products.
Orbit 24 Hour Lighting system allows you to control healthy 24 hour light phases including lunar lighting. It has separate on/off switches for each bulb, giving you opportunity to turn on actinic bulbs without the daylights to similate a dawn and dusk period (before daylights go on and after daylights go off). This will also help avoid fish injuring themselves from the shock of sudden light as well as sudden darkness. You want 10 to 12 hours of light with the first and last hours with actinics only. The lunar light would go on during or after actinics go off and vice versa to turn the lunar light off. This will give the system the needed 8 to 10 hours of full lighting.
We, as a people, know so much more about outer space than we do about our own oceans. This lack of knowledge can very well spell the dangers that lay in wait for us.
The oceans surely would swallow us before a rock comes down to smite the planet of it's life.