Because led lights are usually arrayed in a strip you can get coverage over a wide area of your tank.
Blue light for fish tank at night.
Blue light allows the nocturnal fish to be seen doing what they do best when the lights go out.
If you d like to watch your fish swim around at night you can opt to add a moonlight to your tank.
Whether tis nobler to give your fish a bit of darkness in the evenings or risk stressing them out with a perpetually lit tank.
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.
So called moonlights smallish aquarium lighting fixtures that emit a low intensity usually blue light have been popular with reef aquarists for some time.
My tanks have a 2 hour blue light faze before the light goes out totaly.
Moonlights don t affect the night and day cycle of your fish coral or plants and they don t contribute to algae growth.
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Seriously though if there s one you don t want to do it s stress out your fish.
A moonlight typically features several tiny led bulbs that produce a blue ambient light throughout your tank.
Increasingly internal timers in high end dimmable led units can be set to automatically regulate the transitions between day and night.
I don t think i would leave it on permanent as the active fish during the day stay active as well.
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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.