Having an aquarium with fish at home is a good option for those who want to have animals but cannot dedicate much time. Whether fresh or saltwater, fish will not ask you for great attention, but you do have to give them some primary care: cleaning the aquarium. Apart from food, it would help to keep the place where they will live, the aquarium, in optimal conditions.

One of the elements that you have to consider to keep the aquarium and the fish in good condition is the filter that we put in to regenerate the water. Choosing the most suitable will depend on a series of factors, such as the size of the aquarium or whether it is fresh or saltwater. From Bequia, we tell you what the options are not to make mistakes when choosing the filter for your aquarium.

What are the different leaks?

Mechanics: when the filter acts, it traps the different residues in the aquarium. This debris remains in the filter until it is removed and cleaned. These filters are suitable for freshwater and saltwater fish aquariums.

Chemistry: mechanical filtration means that it alters the composition of the water, that is, the pH, for example. The ionic exchange of resin also modifies the hardness, and the carbon eliminates metabolic elements. You can also use these filters in aquariums with saltwater and freshwater fish.

Biological: this type is a natural filtering system consisting of bacterial colonies capturing dirt and transforming it into non-harmful substances. Biological filters are the most recommended for saltwater aquariums. Also, you should choose one that has the highest power possible to create a good current. But keep in mind that you must accompany the filter with a mechanical one to destroy the organic residues that the biological ones do not extract.

Internal Filters

Internal Filters

First of all, we will tell you which internal filters there are, that is, the ones placed inside the aquarium. This means they occupy space within it and are visible if we do not put them strategically. So there is no problem using them for aquariums with salt or freshwater fish.

Bottom OR Plate Filter

Bottom OR Plate Filter

This filter, of a biological type, is placed at the bottom of the aquarium under the substrate. The filter incorporates a tube with an air diffuser, which will make the water run because it will create a current.

However, you should know that this filter is not very suitable. It is hardly used anymore since it accumulates a large amount of waste. In addition, to clean it, you would have to obliterate it.

Sponge Filter

Sponge Filter

This filter should know that it is suitable only for small and medium-sized aquariums. The most typical thing is that it is used for aquariums with prawns. This filter also works mechanically. The water passes through the foam rubber, which traps the aquarium waste generated by the fish.

In addition to the part of the filter with the foam, you need a tube and an air compressor that makes the water rise through the line. Therefore, this filter works by pumping. In general, it is a device that performs gentle filtering, so it is not effective in large aquariums.

Box Filter

Box Filter

Again, it is suitable for small aquariums, as it does smooth filtering without much power or turbulence. It is a transparent plastic box that is put inside the aquarium.

Inside the box is the filter, incorporating a tube that gives the water force to trap bacteria. Therefore, it is essential to frequently change and clean the filter so that debris does not accumulate.

External Filters

External Filters

As for external filters placed outside the aquarium, you can also focus on various types. For example, they are the most widely used today due to their ease of use and effectiveness. Perhaps the biggest problem with these filters is that they can leak and wet the outside of the aquarium.

Cascade Filter

Cascade Filter

Through this filter, the filtered water returns to its point of return. It does not have great power, but it has been observed that it is highly effective in aquariums with a capacity of fewer than 200 liters. The waterfalls and hardly move. Therefore, the water that returns to the waterfall is the same. In these tanks, the oxygenation is good and, in addition, they currently produce almost no noise.

You have to consider cleaning them properly, since if not, it can cause drips. It is easy to use. So you have to fill it with water and plug it in.

Wet Dry Filters

Wet Dry Filters

There is a dry filter, and there is a wet one. But we propose this other one, the dry-wet filter, which integrates the two into one. So you have to know that it is one of the most efficient biological filters.

The contact area between the water and the air increases with the filter, thus producing a greater gas exchange. Aerobic bacteria are responsible for the degradation of organic matter, and to eliminate them, they need oxygen.

Fluid Filters

Fluid Filters

The sand commonly used is about 3 millimeters thick so that the sand does not become caked and there is a correct circulation of the water; however, much finer sand is used in this. 

The trick is to move the sand gently through a jet of water from the aquarium. Using this procedure, when the filter is in operation, the amount of sand in the filter is “multiplied.” The sand occupies 30% of the filter when it is paused to 50-60% when it is started.

Basket Filters

Basket Filters

It is one of the most used filters due to its mechanical and biological efficiency. There is an external container with the capacity to place filter materials, which can vary.

The amount of water in the aquarium increases through the filter, and it is in this space that a bacterial colony is generated. Herein lies the proper functioning of the filter. That is, the more capacity they have to create this colony, the better the filters.