Keep a saltwater aquarium


Good morning it is normal for marine aquariums to ripen or when they have matured, believe those forms of spots is nothing to worry about since something normal in these types of aquariums.

hello 2 months ago I filtered the water and after 3 months I had life about 15 days and brown things started to come out everywhere in the sand on the rock in the glass I guess it's a kind of seaweed if you could help me I would appreciate it

Keep a saltwater aquarium

We all know that the sea is an impressive habitat for countless species. If you have a saltwater aquarium that recreates, to a minimum extent, marine conditions, you should keep in mind that the type of fish that inhabit inside are very different from those we can take care of in the classic freshwater fish tank.

But not only the types of fish are different, also the care of the aquarium changes. If you have opted for a freshwater fish tank, it is because you are an expert in the field, or consider starting to be. We tell you the keys to care for an aquarium of these characteristics.

Build a small ocean

The first thing you should know is that a saltwater aquarium should not be less than 200 liters, that is, if your fish tank is smaller, you should use it for saltwater fish. It is important that we do not fill the aquarium with fish, since each of them must have a vital space: a fish for every 10 or 15 liters of water. Remember that fish also grow and reproduce, do not neglect their space.

On the other hand, given the dimensions of the aquarium and to create a small ocean in optimal conditions, you will have to install a filter that cleans the impurities and organic waste from the water. In addition to the filters, another series of accessories such as urea separators must be added, and more water parameters monitored than are usually taken into account in a freshwater aquarium.

An aquarium for people with experience

Actually, saltwater aquariums are intended for people who already have some experience in the care of freshwater aquariums, since they require more attention, time and effort. If water is always important in freshwater aquariums, this fact is magnified much more when dealing with aquariums and saltwater species, since fish are much more sensitive to water density, temperature, etc.

Synthetic seawater

The water used in this type of aquarium is synthetic seawater, which is created based on tap water by adding commercial preparations of sea salts (which include the sea's own salts and trace elements), but which nevertheless do not contain Live microorganisms that are beneficial and that will have to be created and colonized the aquarium little by little until water conditioning is achieved. Check daily that the water parameters are correct.

If it has ever occurred to you to create a saltwater aquarium taking water from the sea, discard this idea of ​​beginning, since it would not be safe for fish due to water contamination by man.

Optimal fish species for a saltwater aquarium

The most suitable fish are those that in a natural environment move in contact areas of marine and fresh waters, such as lagoons and estuaries, estuaries and cenotes, although it is also possible to reproduce specimens of brackish waters. Different varieties of butterflyfish are among the most appreciated, but we also find many labrids, surgeon fish and clownfish. However, the boldest can be trapped even with a creature as fascinating as the seahorse. The price ranges also vary greatly, from a few euros to more than 100 euros that are requested for certain specimens of rockfish. But, in any case, it is important to keep in mind that also from this point of view a saltwater aquarium is more expensive to maintain and expand than a freshwater aquarium.

If instead of having an aquarium with species of salt water you are one of those who prefer to see fish in the sea, do not forget to have a MAPFRE Travel Insurance with the most complete coverage for any cancellation or delay leave you without enjoying a Snorkeling day or a whale watching excursion, for example. You choose the plan, we work so that nothing spoils it!

Saltwater Aquarium Installation

The installation of this type of aquarium needs to be given detail to each part that composes it. Therefore, we will divide the composition of the aquarium into each important element and describe the needs.

The bottom of the marine aquarium must allow enough space for the colonies of aerobic bacteria to be established. These bacteria must share the territory with those anaerobes that will be found within the seabed.

The most suitable material for the seabed is coral sand with coarse grains. This material allows us to have a high lime content, which helps us to stabilize the pH. In addition, it gives us a good decorative and natural style.

Depending on what type of fish you have, you will need a bottom or another. For example, for those fish belonging to the order of the perciform, sandy soil is needed. These species are covered with sand during their night rest. Therefore, it is important that, before acquiring a type of fish, we know your bottom line needs.

Salt Water Filtration

To clean the dirt that accumulates in aquariums special filters for salt water are needed. These filters will be able to retain particles larger than fresh water. The filters must be cleaned regularly to avoid contamination of the aquarium water at all times. Only with the clean filter, we can make it last longer and keep the water clean.

On the other hand, we must not over-clean the filter since we will hinder the establishment of bacterial colonies.

Thermo heaters and aquarium pumps

Each type of fish requires a specific temperature. For example, if we want to have a saltwater aquarium of tropical species We will need a thermo heater. This is used to raise the temperature of the water that the fish need. This way they can live properly and not suffer any type of disorder or illness.

Water pumps They are the most important part of the marine aquarium. It is the one that grants the necessary water currents to recreate the marine habitat. Fish require these currents to "feel at home." The bombs must be placed in such a way that there are no places with still waters. You have to try to have a uniform current throughout the entire aquarium.

Sea salt

Since using natural seawater is very complicated, sea salt is needed. Marine water for the aquarium must be prepared using reverse osmosis water and sea salt. This makes the conditions inside the aquarium more stable and does not produce large variations. The SERA sea salt has an excellent homogeneity, and dissolves quickly and without leaving residues, producing a crystalline sea water.

Saltwater aquarium plants

The plants that we will place in the saltwater aquarium require some more specific care. It does not serve any type of natural plant. Each type of plant needs an adequate size of the fish tank. We must calculate the volume of the aquarium necessary to have both plants and fish without "bothering."

Here is a small list of some of the best plants for saltwater aquariums.

Shaving brush

These plants have one that resembles a barber's brush. They are green and their leaves are feathery. Grow better in sand bottoms and it does between 3 and 4 inches per year. They are a good idea to combine with perciform fish of the order that need sandy bottoms. These plants require a lot of light and an intermediate water flow.

Sea lettuce

It is a green algae that serves as food for some herbivorous and omnivorous fish. They are large, have rounded leaves and their texture is rough. They also act as a biological filter since it helps in the elimination of nitrates and phosphates that are harmful. Sea lettuce can be planted at the bottom of the aquarium or let it float freely.

Weed turtle

This plant is also known by the name of maiden's hair. It is a green algae with feathery texture and tube-shaped filaments. Its growth is close to 6 inches per year. It can be planted on the seabed and grows in the form of tufts. It releases a toxin that, while not toxic, is strong enough to deter fish from eating the plant.

Fish for marine aquarium

Like plants, saltwater fish do not require the same care as freshwater fish. Here you have a list of some species of salt water.

This species It is highly recommended for novices in saltwater aquariums. They are 7 cm wide and are lonely. They adapt easily to environments, so they don't need much care. They are somewhat territorial with other fish, but they do not give problems.


The clown fish is a fish very famous for its name and its colorful body. It is advisable that for these fish, the bottom of the aquarium is coral. They are more strict with the water temperature. They can also be somewhat aggressive with other species.

Surgeon fish

The surgeon fish is blue and can reach 40 cm long. They are very popular although their care is very complex. If this is the first time you are going to have a saltwater aquarium, this fish is not recommended. It lives on the reefs and requires great lighting and stable temperature.

The angelfish is for experienced owners. They can reach 30 cm long and are lonely. They adapt well to aquariums and need large sizes. If you take good care of them, they can last up to 10 years.

A basic saltwater aquarium kit It costs around 80 euros. If you are thinking of setting up your aquarium for the first time, it is better to opt for the starter kits.

With this information you can have your marine aquarium ready with the most recommended species of fish and plants.