Why should you not use a red light at night?
Short answer is because human eyes don’t respond well to the color red, so it’s a very poor color choice for illumination purposes.
Longer answer is the whole idea of having lights at night is to be able to see things at night.
Human eyes are more sensitive to green and yellow, less sensitive to blue and red..
Can I leave my aquarium light on 24 7?
Tank lighting should be left on for no more than 12 hours per day. All fish require periods of darkness, similar to their natural aquatic environments. Leaving your tank light on 24/7 will result in the overgrowth of algae and possibly harm the fish.
Do fish need lights off at night?
The fish do not need light and it is best that your 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. So the short answer is no, do not leave your lights on.
Does red light affect fish?
Can fish sleep with a red light on? Yes, red lights are used to light the entire aquarium at night to observe the fish inside. It has been reported that fish cannot distinguish the difference between the color red and others, so using red light won’t affect their sleeping patterns.
What color light is best for fish?
Red, blue and green LEDs are in popular use for standard aquarium lighting since these light temperatures greatly enhance the colors of the objects inside the aquarium. The colors of aquatic plants appear much more rich and vibrant, red fish, shrimp and of course red-leaved stem plants look much flashier.
Why can’t fish see red light?
Fish see full spectrum sunlight. Deep water filters out red light so a lot of fish in deep water are actually red since it renders them effectively invisible (this is why a lot of squind and stuff are pink/red).