Do Fish Like Blue Light At Night?

Many aquariums have blue LED lighting systems that are usually turned on at night.

The eerie blue environment makes the aquarium look otherworldly to the human eyes, a common reason for the enduring popularity of blue lighting.

But it’s crucial to look beyond the aesthetics of blue light!

Do fish like blue light at night?  They do! Blue LED lighting can be used to mark the transition between dawn and dusk, as well as mimic moonlight. Don’t worry about ambient blue light affecting your fish’s night-and-day cycle and the growth of plants, corals, and algae.

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Read on so you can find out more about blue lights for the aquarium.

We will discuss the advantages of LED lighting and the number of hours that LED lighting should be turned on and off.

Choose LED Lighting When Possible

While standard fluorescent bulbs, metal halide lights, and compact fluorescent bulbs are good options for aquarium lighting, these have more cons than pros.

LED lights, such as the AQUANEAT LED Aquarium Light, are highly recommended because of their low heat output.

These lights will not increase the water temperature in the aquarium yet will continue to provide light for your fish.

Nocturnal fish particularly prefer dim blue lighting at night.

The blue lights not only mimic moonlight and, thus, encourage more physical activity, but these also provide them with illumination.

There’s also the fact that blue light allows you, their human parent, to view them well.

LED lights can also be adjusted for light intensity.

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These can be programmed to be brighter or dimmer depending on the time of day, mainly via a timer.

This feature also means lower energy consumption, not to mention that LED lights consume 80% less electricity.

White and blue are the most common colors on an LED lighting system.

But did you know that these also come in a rainbow of colors?

A magenta LED light system will encourage photosynthesis in plants while also enhancing the blues, reds, and greens in the tank.

Consider the Tank Conditions

The number of hours that the blue LED lights are on at night is also crucial for the fish’s health and the tank’s overall conditions.

In a freshwater tank, you can run the lights for about two hours after turning off the tank’s main lights. In the case of a saltwater tank, you may run the blue and white lights for a longer period.

But you should also consider the specific needs of your fish were lights on, lights off are concerned.

Keep in mind that most fish species require sufficient hours of complete darkness to sleep.

As such, the number of hours the blue lights are kept on should be within the recommended 12-hour daytime-like conditions.

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For example, turn the lights on for 12 hours during the day and then turn them off for 12 hours at night, if your fish are diurnal.

You can reverse the cycle in case of nocturnal fish.

You may turn on the blue lights for two hours within the 12-hour daytime hours, preferably as dusk nears.

Conclusion

Fish have their specific lighting needs for their proper growth and development. Your job is to know what type of light they need, the number of hours they need it, and the effect on their body.

You will want blue lights for them at certain hours of the early evening, if possible.