How To Light Up A Fish Tank
It doesn’t readily occur to people that the aquatic creatures in ponds, lakes, rivers, what have you, live the same way that we do – on energy from the sun. It’s easy to look down into the gloomy half-dark world they inhabit and to feel that in an aquarium, they could not want anything more than to be kept in a dark corner all the time and be blinded with bright lights when guests need to see how the light bounces off their iridescent scales. As it turns out, fish and all the pretty plants in an aquarium don’t quite work that way.
The light from the sun and moon may not be quite so bright for them in their natural habitat, but it does exist, and if you see yourself running an aquarium full of bright happy and healthy fish, you do need to replicate for them in your aquarium lighting, the kind of light and darkness that they would have enjoyed in their natural habitat.
Aquarium lighting comes in all kinds intensities and technologies. There are the regular fluorescent strips, the compact fluorescent lamps, metal halide lamps and light emitting diodes – every kind of lighting technology there is, as you can see. If what you have on your hands is an aquarium with freshwater fish, these can survive very well on low-intensity fluorescent lighting. Fish actually like fluorescent lighting much better than incandescent bulbs. Fluorescent lights run cooler, and the light they put out is closer in appearance to daylight. If you’ve been kind to your little finny friends, you’ll have a few little plants colorfully waving around your tank looking for a little light for their photosynthesis.
Plants can’t do with the mild lighting that fish can get by on; they will need brighter aquarium lighting, typically around 5 Watts of fluorescent light for every gallon of water your tank holds. Plants actually use the light they receive for energy; if you have a saltwater aquarium, the algae on the live rock you’ll have used, will appreciate much better lighting too. The key word here is “full spectrum lighting”; these life forms need to receive light on all the wavelengths or colors that the sunlight would let them have. Regular fluorescent lighting will work fine, but actinic light will work even better for plants and algae.
But there can be too much of a good thing too when it comes to lighting. The fish have wake- and sleep-cycles just like us; the idea is then to give them as much darkness as they would have in nature. About 12 hours of darkness would not be a bad idea. Using aquarium lighting of too high an intensity or leaving it turned on for too long can be harmful for the environment in the tank; nuisance algae tend to feel encouraged and tend to take over your tank if there is too much lighting too. A good way to go about it would be to buy an aquarium light timer. The fish will have a steady day- and night-cycle they can count on and you can be sure that you will never forget to make the sun come up or go down for the fish. You wouldn’t want to pull a Truman Show climax-like scene on your fish now would you?
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