Fish Sleeping With A Light

Aquarium lights are essential accessories for those fish living in tanks. It can help them regulate their sleeping and food pattern behavior, and all fish require some periods of total darkness.

Aquarium lights can illuminate fish colors, make it easier to spot tank problems, and regulate your fish’s sleeping and eating.

Can fish sleep with a red light on? Yes, red lights light the entire aquarium at night to observe the fish inside. It has been reported that fish cannot distinguish between red and others, so red light won’t affect their sleeping patterns.

A Must-Read: Do Angelfish Sleep?

In this article, you will learn about aquarium lighting, its benefits, and what seems to be the appropriate timing to give them lights or entirely shut them off.

Fish Lighting Requirements

Before introducing them to different lightings, you need to consider and check your species’ requirements, as it varies depending on their species.

In general format, a fish requires 12 hours of light a day. For instance, goldfish lose their color if they don’t have enough light, and some species lose their appetite if they don’t get enough lighting throughout the day.

It can also jeopardize their sleeping pattern, as too much light won’t help them sleep comfortably.

Problems From Light

Another instance you need to consider regarding proper lighting is the algae overgrowth.

When your tank is lit 24 hours a day, algae can quickly grow, making your tank look dirty if you have natural plants in it.

Some fish need some darkness to help them sleep, and without proper sleep, they can become sluggish and stop eating.

Some also developed some aggression towards their owner if they had too much lighting in the tank.

Light Timing Methods

Light timers are essential when it comes to the regulation of your fish’s day/night routine.

Simple set the timer to turn off the lighting and set another one to turn it on the next day.

If you do not use light timers, you can set the alarm on your mobile phones to turn it off and turn it back on each day.

Consistent light cycles can replicate the daytime and nighttime in their surroundings, reducing stress and mimicking their natural habitat.

Regulating Temperature

Temperature is also a critical factor when considering lighting methods. If you use heat light to warm your aquarium, it is best to use an aquarium heater instead.

It is particularly if you have some tropical fish that requires warmer temperatures.

Ceramic bulbs are also an excellent alternative to produce heat without producing light.


To conclude, fish sleep, too, regardless of its day or night.

They can also sleep for an extended period, which is why it is essential to maintain periods of light and dark with your aquarium lighting, regardless of whether you have total darkness or red light.

It stimulates their daytime and nighttime and makes sure they have enough sleeping areas to rest.

Give them enough lighting, and they will be stress-free and happy fish in general.