As mentioned its more of a benefit to humans than it is to fish.. Natural habitats don't even have that much light all day long.. It will all come down to what kind of setup you want for the tanks purpose.. Breeding or show.. I guess in breeding tanks its better with minimal lighting in the tank and whole room.. For show tanks, sky is unlimited..its your choice.. I have LED's running on mine with a built in ramp timer to simulate sunrise and sunset..
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