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Fish solicit bait, reproduce, hunt, escape from enemies, and cluster are the main behaviors in their natural environment, and each of these behaviors is closely linked to light. During the evolution of billions of light years, fish received light signals through photoreceptors in the retina and pineal gland, perceived and adapted to the light environment in their natural habitat, and over time developed a unique visual physiology.

The basic structure of the fish eye is similar to the developed eyes of higher vertebrates, with an absorption spectrum of 430-620 nm. In low light, they can only see the rough outline of objects and have no color vision.

Visible light in the short wavelength of blue light up to nearly 100 meters, and visible light in the long wavelength of the red, orange and yellow spectrum is dominant. Generally, the fish retina with the visual pigment and the spectrum of the water inhabited by the light peak is the same, so the deep water fish spectral sensitivity curve in the short wavelength range, it is sensitive to blue and green light.

And near-shore seawater fishes, is biased in the long wavelength range to absorb light. But, after all, how can we ensure that aquarium fish get enough light? The best way is to install the right light in the aquarium.

Usually, the choice of aquarium lamps and lanterns is mainly based on the species of ornamental fish to decide.
For example, blood parrot fish and red dragonfish are more suitable for red lighting, which can have the effect of increasing color. The lakes cichlids are more suitable for blue light, because it can give a sense of deep space.
Most tropical fish are suitable for white light, which is in line with the law of nature, and this light can better reflect the natural beauty of tropical fish.
Water Underwater Fin Organism Body of water

Tips to set lighting for tetra:
If you have tetra in your tank, then you should know that tetra is timid. It is better to use diffused light for the aquarium lights to avoid direct light bringing discomfort to the fish.

When you turn on the light, you may still wonder why the fish are hiding in the plants or hiding under the rock. This is an instinctive reaction due to the change of environment, the fish will swim out on its own when it gets used to it. Tetra likes dark light when resting, and needs dark light or no light when breeding. If you set the light according to its habit, it will become more active.
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