Aquarium fish do not need light and it is best that you turn it off during the night. Leaving the light on can cause stress to fish as they need a period of darkness to sleep. Too much light will cause algae to rapidly grow and make your tank look dirty.
Are fish bothered by light?
Fish are not as reliant on light as plants. In general, aquarium owners can use incandescent, fluorescent, or LED lights for fish but should be aware of the heat issues that incandescent lights cause.
Are fishes sensitive to light?
Fish retinas generally have both rod cells and cone cells (for scotopic and photopic vision), and most species have colour vision. Some fish can see ultraviolet and some are sensitive to polarised light.
Why do my fish freak out when I turn on the light?
Well, that's exactly how your fish feel each time you suddenly turn on the light. Drastic changes in light levels can startle pretty much everyone, including the fish. Hiding is their defensive reflex triggered by switching from dark to light too suddenly. If you leave the light on, the fish will come out eventually.
Are LED lights too bright for fish?
Again, depending on the kind of fish you have, you'll want to think about color temperature. But in general, the lighting shouldn't be too bright for a regular tank since it could stress the fish. Too-bright lighting can also lead to algae growth.
How do fish react to light?
Rather, when exposed to bright light, the rod cells of most fish react by migrating deeper into the retina, while the cones move toward the surface. When the light dims, the rods move toward the surface while the cones retreat.
Do LED lights scare fish?
Underwater LED lights can also be used for the same purpose, but make sure they're not super bright or they may scare some fish away. And always, brush up on your local fishing licence rules to make sure you're in compliance. LED lights emit a bright enough light to penetrate the water and attract fish.
Are LED lights OK for aquariums?
Low heat output: LED lights do not generate the heat that fluorescent light bulbs do, so they won't heat up your aquarium water. However, they still need good air circulation so the heat they put off doesn't degrade the lifespan of the LED chip and keep them away from other types of lighting.