No.
They prefer one.
they don't. i have my gold fish in a glow fish tank with a blue LED light and he acts just fine. ;) Light has no effect on a Goldfish's behavior other than the fact that a goldfish will usually go to sleep when the lights are turned off.
UV light(s) influences behavior, physical appearance, and overall health in goldfish. They control when and at what times a goldfish will sleep, they also play an essential role in the color of the goldfish (a lack of light will result in paler fish), and provide energy for aquatic foliage- which results in the production of oxygen resulting in consiquently healthier fish.
well it depends when the light are off or not
the lack of light being in the dark
See if your goldfish likes something that shines ,like a wand with glitter, and lift it up as high as you can then it might follow
if the light is a dark light probebly not, but if it is bright it will hope that helps!! :o)
i just got a goldfish from my friend and its a year old ..it looks light brown and big eyed .
Goldfish
Goldfish can lose their orange color due to light deficiency or dietary deficiencies. In these cases, the color change is often reversible.
Perhaps your goldfish has photodermatitis, which is a condition that causes the photons from any source of light, especially the powerful and normally life-giving sun, to cause a type of inflammation on the skin, or in this case, the scales. The best thing to do in this situation is to keep your goldfish in the cupboard, or even the freezer. Good luck!
Males will start fertilizing the eggs that come from a female goldfish's body immediately. Once the eggs are released the male will follow up and fertilize them.