There are even arrays with different colors of led lights you can program for your needs.
Blue light for fish tank at night.
Increasingly internal timers in high end dimmable led units can be set to automatically regulate the transitions between day and night.
To keep the aquarium light on all night or not to keep the aquarium light on all night that is the question.
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So called moonlights smallish aquarium lighting fixtures that emit a low intensity usually blue light have been popular with reef aquarists for some time.
Whether tis nobler to give your fish a bit of darkness in the evenings or risk stressing them out with a perpetually lit tank.
The blue comes on to simulate the moons light so obviously when the white goes off i keep my blue on until midnight 4 hours with white then 4 hours blue is just plain stupidity.
I don t think i would leave it on permanent as the active fish during the day stay active as well.
If you d like to watch your fish swim around at night you can opt to add a moonlight to your tank.
If you want a night lunar light that will make your fluorescent fish glow 445 nanometer royal blue lights are popular.
It actually stresses the fish more switching lights on off simulating day night periods when it should be daylight 8 hours for white light if you have plants or 6 without.
A moonlight typically features several tiny led bulbs that produce a blue ambient light throughout your tank.
Seriously though if there s one you don t want to do it s stress out your fish.
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Blue light allows the nocturnal fish to be seen doing what they do best when the lights go out.