Aquarium Lighting For Reef Tanks

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A topic that is not discussed very often is aquarium lighting for reef tanks. Although this topic is not discussed very much it is very important within a salt water reef tank.

Water quality gives the tank stability as well as providing the corals with the essential elements. Aquarium lighting provides the corals with energy which they then use to grow. Water movement allows nutrients to be delivered to the corals for them to feed upon, as well as washing away waste. Water movement is also essential when natural filtration is used in the reef tank.

Inside all corals are millions upon millions of what is called symbiotic algae. The only exceptions are those corals which are classified as non-photosynthetic. These obtain their energy from feeding rather than from light itself. Photosynthetic corals obtain their primary source of energy from light and then also actively feed to obtain more energy. The symbiotic algae within the corals obtain energy from the light and then pass this energy on to the coral itself – a match made in heaven!

Different corals have different lighting requirements. For example, short polyp stony corals require much more intense lighting than soft corals do.

When choosing aquarium lighting for reef tanks you need to check two things in your reef tank. The first is the corals themselves, so that you can ascertain their requirements, and the other is the depth of the aquarium itself. Checking the depth is important as light can only penetrate so far into water before the colour is removed. It is amazing how quickly water can remove colour from light.

The depth of your aquarium as well as the corals you keep will determine which type of lighting you require. For example, if you keep soft corals then you could possibly just use fluorescent tubes. However, if you keep short polyp stony corals then metal halide lighting will be required. The depth needs to be checked because if you have a deep aquarium then the colour might not penetrate to the bottom of the aquarium. Water has the ability to be able to strip out colour at an amazing rate, therefore if you have a deep aquarium you will need lighting of enough power to be able to push the light to the bottom of the aquarium.
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