No, fish don't need darkness to sleep. However, it is recommended to turn off the aquarium light at night. Because, most of the aquarium fish are diurnal (active in day time and sleep at night).
Is it OK to keep fish in the dark?
Fish do not need light at night. A period of darkness is necessary for the fish to sleep. Also, leaving the lights on all night could cause algae to rapidly grow and take over your aquarium.
What kind of lighting do fish like?
Depending on a fish's lifestyle, they may be better at seeing in low light, such as the bottom of a murky lake, or in bright light, like those fish living on sunny coral reefs. Some fish are even able to see ultraviolet and polarized light, something humans are unable to see.Jan 17, 2020
Is blue light good for fish at night?
Blue light is frequently used in aquariums to mark the days and nights out for the fish or for fishkeepers to get a clear view of their tank. Blue light is harmful to fish if it is incorrectly used. However, most fishkeepers use blue lighting in their tanks with no ill effects.Mar 30, 2021
Does blue light make fish glow?
https://www.youtube.com/watch?v=d1_qlpyP-HY
Why do we need night light?
According to, night light affects the production of melatonin in the body which is a sleep-enhancing hormone. Night light throws this hormone out of balance affecting sleep negatively. However, this is usually the case if the lights are very bright. Dim lights don't hurt, in fact, they can be beneficial for sleep.Jun 22, 2020