![]() ![]() Human beings have binocular vision, meaning that both eyes can focus on one single object. That’s why you should always switch on the room lights before you turn on your tank LEDs. So, you can see why turning on your aquarium light in a completely dark room can alarm your fish and could even hurt your fishy friends’ eyes. In fish, the process takes around 30 to 60 minutes. Brightnessįish are unable to dilate and contract their iris as quickly as you and I can. However, fish vision is not as sharp as that of humans and can appear blurred and contrasted.Īlthough that might seem like a disadvantage, fish can actually make out objects pretty clearly through a high-contrast image. Predatory fish can typically focus on one single object, whereas other species that are foragers rather than hunters cannot. For example, fish that live in deep water environments, such as the ocean, cannot see the color red. However, it’s thought that the shades and hues the fish can see are a bit different from yours. Most aquarium fish can see colors in much the same way that you can. ![]() So, both your fish and your plants need light each day to thrive. However, aquatic plants need between 8 and 10 hours of overhead light every day to enable them to photosynthesize and grow.
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