Can Goldfish See In The Dark? What You Need To Know

Have you ever wondered after turning off all the lights at night, can goldfish see in the dark?

Goldfish cannot see in the dark, but they have a highly developed sense of smell which they will use to navigate around the tank at night if they need to. They will also use vibrations in the water to help them sense where they are going.

Can Goldfish See In The Dark

Should I Turn Off The Light In My Goldfish Tank At Night?

The fish do not need light and it is best to make sure the lights are turned off at night. If you leave the lights on, the fish will not be able to sleep and this will lead the fish to become stressed.

If your fish are unable to get enough sleep the stress level in the fish will continue to raise and can even lead to death of the fish.

How much sleep does a goldfish need? A goldfish requires a minimum of 6 hours sleep a night.  The recommended amount of sleep a goldfish should have is 8 – 12 hours a day.

If possible keep the fish in a well lit environment for 12 hours and in dark for 12 hours.

For more information about goldfish sleeping take a look at this article I wrote.

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Can Goldfish Navigate The Fish Tank In The Dark

Goldfish use their amazing sense of smell to easily navigate around the fish tank at night, They also sense vibrations in the water to help them navigate where to go.

Goldfish require at least 12 hours of light a day, It is important they get light every day because this helps with their natural cycle.

Do Goldfish Require Complete Darkness To Sleep? Fish require darkness to sleep, it is important for your goldfish as they require 8 – 12 hours sleep every day.

Can Goldfish Eat In The Dark?

Goldfish have an amazing sense of smell which means they will have no trouble to locate a meal when it is dark and they can not see clearly.

Having said that goldfish usually eat during the day and not through out the night.  They will only eat in the dark if they are very hungry or not getting enough light during the day.

Why Do My Goldfish Go Crazy When I Turn The Lights On?

The most likely cause is that they were sleeping when it was dark and you startled them and made them disorientated for a few seconds.

If they were awake you probably just scared them.

I recommend you place your aquarium somewhere it will get natural light, this way the light will increase slowly in the morning and is less likely to upset the fish.

Do Goldfish Have Good Eye Sight?

Goldfish have amazing eye site and can even see objects up to 15 feet away.  In fact a goldfish eyesight is superior to us humans.

Do Goldfish Have Good Eye Sight

This is why you might see your goldfish dart around in the water if they see something in the room move, even when the other side of the room.

They also only see three colours red, green and blue like us, and they can see ultraviolet light which makes them sensitive to polarized light.

Can I Leave My Aquarium Light On 24 / 7?

You should not leave the aquarium light on for more than 12 hours a day.  Fish require around 8 – 12 hours a sleep a day and the darkness will help them to settle and fall asleep.

Fish generally cannot fall asleep when the aquarium light is on.  If your fish cannot sleep it will become stressed and this can even lead to the fish dying.