Before going on to detail the care that corals need in an aquarium it will be convenient for you to be clear about exactly what corals are in order to act correctly, and once you know what they are, you can learn how they behave and how they feed.

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What exactly are corals?

The first thing you should be clear about is that corals, despite their plant appearance, are not and are not coloured stones, or decoration that moves. Corals are living beings that belong to the animal world, surprised? As animals they belong to the group of Cnidarians (they have stinging cells that they use to defend themselves or capture prey so be careful when handling them) and they need minimal living conditions.

Important

As a curiosity we tell you that their closest relatives are jellyfish and anemones.

Actually, as a general rule, each coral is made up of clusters of many small animals called polyps. And if you dare and are very careful you can try to cut them, so that each piece continues to live separately with its independent animals. If you look closely you will see that they are cylindrical in shape and that they have tentacles at the top and a single hole that serves as mouth-anus through which they feed and make their needs.

Roughly speaking, corals can be divided into two large groups:

• Soft corals, for which maintenance becomes more or less easy.
• Tough corals, for which you have to be a little more careful to maintain stable values ​​in the elements such as calcium, strontium or magnesium and important parameters such as pH or kH to be able to form your calcium carbonate skeleton.

How do corals feed?

If you dare to have corals in your aquarium, with all this that we have told you about corals you can think that it will be difficult to feed them but fortunately, in most cases, feeding is a more or less simple task, Since the zoonxantheles microscopic algae that are installed in the body of the corals help them to live through a symbiosis: by making photosynthesis they provide the nutrients for the coral polyps to survive. In return, corals offer algae protection against predators. A kind of barter in which they exchange sugars for safety.

This is why it is very important that in your marine aquarium with photosynthetic corals you install good lighting, so that these algae can obtain food well through photosynthesis. Specifically, the light that these algae most like is blue (also called actinic), hence it is so important that you include at least 1/3 of blue light on the screen.

Marine led light

To calculate the amount of light you need you can guide yourself with this scale: 1W per liter of water. Although everything will depend on other factors such as the height of the aquarium, the type of light, etc. It will also be advisable to make water changes (conditioned with a good salt) as often as possible, to be able to replenish the minerals and trace elements that corals consume from water constantly. Try adding vitamins and amino acids to the water from time to time that help corals to be in good health.

How do corals behave?

Do not think that because they cannot move actively, they do not need a certain vital space between them. If they are too cuddled, they can face each other, even one of them dies. Therefore, be careful to keep them separate.

Another important factor is to choose the fish with which they live together, since some, such as butterfly fish, feed exclusively on their polyps. So if you don’t want to run out of coral, don’t mix them!

The importance of ecology

Finally, we would like to highlight that for reasons such as global warming, acidification of marine waters, etc., the aquarium ecosystem is in danger. So much so that all hard corals are grouped in the CITES II international protection category, so illegal trade in corals is strictly prohibited. For this reason, you must contribute to the cause and acquire them only in specialised stores where they assure you that they have been obtained with the greatest possible care and respect, complying with all regulations. Also, if you travel somewhere where corals live in their natural habitat like a beach or a reef, be very careful not to hurt them.

A window to the ocean at home

Marine fish tanks with coral reefs are the most expensive for those who want to have a replica of aquatic life in their living room; the big ones cost up to $ 200,000.

A faint wave of seawater caresses the coral reef, while a group of multi-coloured fish roams the live rocks, in the very noses of a hermit crab. The scene is produced in the living room of the home, but it is not part of a documentary about aquatic life: it is an instant inside a luxury fish tank, the closest thing to a piece of ocean inside the house itself.

To talk about premium aquariums is to talk about large glazed structures, ranging from 500 to 3000 litres, and that recreate the marine habitat around a coral reef. To give yourself the pleasure of having the greatest of them, you have to count on $ 100,000, just to buy the fish tank and all the equipment that will make it work properly. Completing the “album” with different species will require another $ 100,000.

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