Saltwater aquariums and their special care


Having a fish aquarium at home is a great idea. They are an excellent example of living decoration, like having a piece of ocean at home. Would you like to have saltwater fish at home? So, this article interests you! We tell you what they need to live in an aquarium and we talk about the main species of sea fish. Do not miss it!

How saltwater fish are and what they need

The truth is that Each species of saltwater fish has different characteristics, as well as different needs of temperature, salinity and environment in the water. That is why it is very important that you inform yourself about the needs of those that interest you to prepare you as well as possible.

As expected, Saltwater fish need salt water to live. You will have to prepare an aquarium with the right salinity, to know that you are doing well, You will need a hydrometer to control salt levels. These should be approximately between 1,020 and 1,023. This is approximately 34 grams of salt per liter of water.

But you should not use common salt! You will find saline preparations for aquariums in specialized stores. In addition, there they can tell you the correct proportions depending on the fish you want to have.

The same goes for the temperature, on average, we can say that saltwater fish live in 26º, but there may be slight variations between species.

Necessary elements in an aquarium for saltwater fish

In addition to water, salt preparation and hydrometer, You will have to equip your aquarium well with some elements:

  • To control the water temperature, a regulator thermostat
  • To reduce the frequency of water cleaning, it is necessary to place a filter. This will keep the water well sanitized and your fish will live the same as in the sea.
  • Too It is important to control the pH and levels of calcium and nitrates in the water. Do you feel very lost? Quiet! In the establishment you choose they will explain everything to you very well.
  • Just as you would any other aquarium, look for a gravel for the background and decoration, always keeping in mind that your fish should have enough free space to swim in peace.
  • Consider the amount of saltwater fish you plan to have when choosing the size of your aquarium. An advice? If you doubt between two, take the biggest one! It will never be too big for them, but it can be a problem to have chosen a very small one.
  • The place where you place your aquarium is also essential: You should give it direct sunlight for several hours a day.

Main species of saltwater fish

Now, it's time to talk about little fish! Among the saltwater species, the most notable are:

If it's going to be your first time riding a saltwater aquarium, damsels are an excellent choice for newbies!

They are fish about 7 cm in size They are quite lonely and adapt very well to different environments. The only thing to keep in mind is that they can be a bit aggressive and territorial with other fish, even of the same species, so make sure they have enough space to swim without being disturbed!


Be sure it sounds to you, In addition to being mega-famous by its name and colorful body, Surely you've seen the movie "Looking for Nemo"! If you remember, you will know that Nemo lived in a coral reef! And is that these fish they always choose these places to live, since they are always surrounded by anemones, the perfect hygiene companions of the clownfish.

Too they tend to adapt well to aquarium life, although it is a little more complex to acclimatize the water. Yes, we must bear in mind that they are a little special when choosing neighbors: while with other species they usually get along, with other clown fish they can be a bit aggressive.

Blue shadow surgeon fish

There is no Nemo ... without Dory! This bluish fish was chosen as the funny and forgetful friend of the clownfish. They are much larger than the previous ones, being able to reach the 4th cm.

Despite being one of the most popular saltwater fish in aquariums, this It is not so easy to maintain and is more complex for novice aquarists. In the natural environment, the surgeon fish lives in reefs, in the aquarium, it will need stable lighting and temperature.

Emperor Angel Fish

The emperor angel It is a fish for experienced owners. They are fish of less than 30 cm long which is quite lonely and adapts well to life in the aquarium. Well kept, can live up to 10 years!

You need a fairly large aquarium and a varied decoration of rocks and plants between which you can swim.

Within the gobies, There are more than 2,000 species. They are small fish of approximately 10 cm that live in community and are easy to maintain. If you have no experience, gobies are another good option for you.

These saltwater fish they adapt well to aquariums and slight changes in temperature and environment. Some species of gobies are cleaning fish, that is, they eliminate the parasites of their companions. Other, they become symbiotic fish that defend crustaceans in exchange for shelter and food at their expense.

Magenta Dwarf Perch

This saltwater fish you don't need a space too big to live, although you do need the aquarium decoration to offer you opportunities to hide and shelter. It can be something territorial with other small fish.

Magenta Dwarf Perch It is a beautiful colored hermaphrodite fish, It gives a lot of life to a domestic aquarium! But you should inform yourself well about your needs before choosing it.

We hope that this selection of saltwater fish has helped you find your favorite. Do not hesitate to go to a specialized center to get more information. on the needs and compatibilities between aquarium fish.

The saltwater aquarium

The marine water aquarium should be as large as possible to achieve maximum stability in water quality (with a minimum length of 90 cm. And a width of 30 cm.) It should be deep, because the fish sailors do not live only on the surface, and spend as much time swimming vertically from top to bottom as horizontally.

Almost all the fish in a tropical marine aquarium are coral reef. In coral reefs, the level of water oxygen is stable and water temperatures are usually constant. Light levels are very high. This stable natural environment is the cause of marine fish difficult to maintain. These fish are not prepared to deal with significant environmental variations, contrary to what happens with freshwater fish.

Tropical corals require salt water

Tropical marine aquariums should have more hiding places than fish, and for excavator species, have a sufficiently fine substrate. The sand used is coral with a calcium carbonate composition, formed by skeletons of coral animals.
In the cold-water marine aquarium, temperature, pH, water density and salinity must be controlled, and a water cooler must be used.

We have to watch where we place the aquarium, since salt water can spoil furniture or carpets, we must make sure to put it in a place where we can fill it or empty it without causing domestic damage. It is essential to have a glass cover that fits perfectly. Not only will it prevent fish from jumping, but it will reduce water evaporation, which could lead to drastic increases in salinity.

For many years, the care of marine fish was hampered by the need to use natural seawater (which had to be purified and stored for use) because the mixture of artificial salts was unsatisfactory. Currently, "sea salt" is available to be mixed with tap water to produce excellent synthetic water in which marine fish can thrive. Another important characteristic of seawater is its alkaline pH, usually around 8.0-8.3.

Carbon dioxide, produced by animals, dissolves in water and tends to make an acidic pH. In the conditions of a salty aquarium, if you don't go carefully, both pH as nitrogen levels can fluctuate, since the buffering action of the ocean is absent.
Fluorescents should provide bright, ultraviolet-rich light that fish need for their health, and that highlights their colors. Too much light is not dangerous, on the contrary, it will facilitate the growth of algae, marine fish feed on algae, and these, on the other hand, help neutralize the toxic residues of fish.

It is recommended to use a biological filter. It is important that the vacuum cleaner be as powerful as possible, to create an adequate salt water stream. Bacteria that grow in the filter transform or make decomposing products of fish excretion less toxic.
You have to help this type of filters with a filter that contains active carbon. Activated carbon chemically destroys organic waste that is not extracted by biological filters. In this filter, bacteria are also installed in the long run, and make it doubly effective.

To achieve better water purification, in addition to the conventional filter, protein skimmers, ultraviolet and ozone lamps can be used.

Successful care of marine fish needs frequent condition checks to avoid any problems. However, in practice, once the saltwater aquarium has been properly installed, this means a few minutes of work each week.

The marine species that we will acquire for this type of salty aquariums are considerably more expensive than those of freshwater, but the beauty that we can achieve with these fish, in addition to corals, is indescribable, and will make all the effort and work done worthwhile.

A saltwater tropical marine aquarium